Share-based compensation expense Adjustments for share-based payments Foreign exchange translation reserve Reserve of exchange differences on translation [member] Entity File Number Entity File Number Proceeds / (Loss) from disposal of non-current assets Proceeds (Loss) From Disposal Of Non-Current Assets Proceeds (Loss) From Disposal Of Non-Current Assets Disclosure of detailed information about business combination [line items] Disclosure of detailed information about business combination [line items] Issue of shares related to acquisition Increase (decrease) through acquisition of subsidiary, equity LIABILITIES - CURRENT Current liabilities [abstract] Options exercised during the period (in shares) Number of share options exercised in share-based payment arrangement Depreciation, amortisation and impairment of non-financial assets Adjustments for depreciation and amortisation expense and impairment loss (reversal of impairment loss) recognised in profit or loss Disclosure of income tax [Abstract] Disclosure of income tax [Abstract] Disclosure of income tax [Abstract] EQUITY Equity [abstract] Deferred consideration, acquisition-date fair value Deferred Consideration, Acquisition-Date Fair Value Deferred Consideration, Acquisition-Date Fair Value Disclosure of disaggregation of revenue from contracts with customers [table] Disclosure of disaggregation of revenue from contracts with customers [table] TOTAL Beginning balance Ending balance Equity OTHER COMPREHENSIVE INCOME Other comprehensive income [abstract] Property, plant and equipment Property, plant and equipment GROSS PROFIT Gross profit Contingent consideration Non-Current Contingent Consideration Non-Current Contingent Consideration Insurance Insurance [Member] Insurance Interest and debt financing costs paid Interest And Debt Financing Costs Paid Classified As Financing Activities Interest And Debt Financing Costs Paid Classified As Financing Activities Statement of changes in equity [line items] Statement of changes in equity [line items] Net finance (expense) / income Finance (Expense) Income, Net Finance (Expense) Income, Net Corporate information and statement of IFRS compliance [abstract] Dilutive effect of all instruments on weighted average number of ordinary shares (in shares) Dilutive effect of all instruments on weighted average number of ordinary shares Options granted during the period (in shares) Number of share options granted in share-based payment arrangement Disclosure of entity's operating segments [Abstract] Disclosure of entity's operating segments [Abstract] Disclosure of entity's operating segments [Abstract] Payment for acquisition of subsidiary, net of cash acquired Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities Investment in own shares Investment In Own Shares Investment In Own Shares EIP Equity Incentive Plan [Member] Equity Incentive Plan [Member] Total Average number of employees Disclosure of non-adjusting events after reporting period [abstract] Interest income Adjustments for interest income Going concern Description of Accounting Policy for Going Concern [Policy Text Block] Description of Accounting Policy for Going Concern [Policy Text Block] Fair value movement on contingent consideration Adjustments For Fair Value Of Equity Consideration Adjustments For Fair Value Of Equity Consideration Weighted average exercise price of share options outstanding in share-based payment arrangement (in gbp per share) Weighted average exercise price of share options outstanding in share-based payment arrangement Share buyout (treasury shares) Increase (decrease) through treasury share transactions, equity Share premium Share premium [member] Statement of financial position [abstract] Statement of financial position [abstract] Summary of disaggregated revenue by geographical split Disclosure of disaggregation of revenue from contracts with customers [text block] Application of New and Revised International Financial Reporting Standards (IFRS) Disclosure of changes in accounting policies, accounting estimates and errors [text block] Payment for repurchase of own shares Payments to acquire or redeem entity's shares TOTAL COMPREHENSIVE EXPENSE FOR THE YEAR ATTRIBUTABLE TO THE EQUITY HOLDERS OF THE COMPANY Comprehensive income, attributable to owners of parent Research and development tax credit Adjustments For Research And Development Tax Credit Adjustments For Research And Development Tax Credit Capital redemption reserve Capital redemption reserve [member] TOTAL Current liabilities Payments Payments [Member] Payments And Financial Services [Member] Share capital Issued capital Exercise of options Increase (decrease) through exercise of options, equity Deferred tax assets Deferred tax assets Share premium Share premium Schedule of particulars of employees (including directors) Disclosure Of Detailed Information About Employees Explanatory [Table Text Block] Disclosure Of Detailed Information About Employees Explanatory [Table Text Block] FINANCING ACTIVITIES Cash flows from (used in) financing activities [abstract] Corporation tax payable Current tax liabilities, current Disclosure of share-based payment arrangements [Abstract] Disclosure of share-based payment arrangements [Abstract] Disclosure of share-based payment arrangements [Abstract] Weighted average remaining contractual life (in years) Weighted average remaining contractual life of outstanding share options Interest expense Adjustments for interest expense Other Other Industries [Member] Other Industries [Member] Products and services [axis] Products and services [axis] Total comprehensive income for the year Comprehensive income Statement of changes in equity [abstract] Statement of changes in equity [abstract] Retained earnings Retained earnings Tax on (loss) / profit on ordinary activities Income tax charge Tax expense (income) Cash Flow Adjustments and Changes in Working Capital Disclosure of cash flow statement [text block] Subsequent events Disclosure of events after reporting period [text block] OPERATING ACTIVITIES Cash flows from (used in) operating activities [abstract] Share Success Plan (SS) SSP (under EIP scheme) Share Success Plan (SS) [Member] Share Success Plan (SS) SAYE SAYE [Member] SAYE [Member] TOTAL ASSETS Assets Selling, general and administrative expenses Selling, general and administrative expense Document Period End Date Document Period End Date Tax on (loss) / profit on ordinary activities Current tax expense (income) Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] LTIP Long term Incentive Plan (LTIP) [Member] Long term Incentive Plan (LTIP) [Member] Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] Decrease in trade and other receivables Adjustments for decrease (increase) in trade and other receivables UK UNITED KINGDOM Schedule of cash flow statement adjustments Disclosure Of Detailed Information On Supplemental Cash Flow Statement Explanatory [Table Text Block] Disclosure Of Detailed Information On Supplemental Cash Flow Statement Explanatory [Table Text Block] Earnings per share [line items] Earnings per share [line items] (LOSS) / PROFIT FOR THE YEAR AND PROFIT ATTRIBUTABLE TO THE EQUITY HOLDERS OF THE COMPANY (Loss) / Profit for the year, attributable to equity holders of the Company Profit (loss), attributable to ordinary equity holders of parent entity, used in calculating basic earnings per share Goodwill Goodwill Disclosure of detailed information about business combination [abstract] Disclosure of detailed information about business combination [abstract] Entity Address, City or Town Entity Address, City or Town Financial assets and other receivables Non-Current Financial Assets And Other Receivables Non-Current Financial Assets And Other Receivables Document Type Document Type Share-based compensation Expense from share-based payment transactions with employees Direct cost of sales Cost Of Sales, Direct Cost Of Sales, Direct Share capital Issued capital [member] Geographical areas [axis] Geographical areas [axis] Particulars of Employees (including Directors) Disclosure of information about employees [text block] Other liabilities Other non-current liabilities Profit or loss [abstract] Profit or loss [abstract] Lease liabilities Non-current lease liabilities Earnings per share [table] Earnings per share [table] Revenue Disclosure of revenue from contracts with customers [text block] JSOP Joint Share Ownership Plan [Member] Joint Share Ownership Plan [Member] Ordinary shares repurchased (in shares) Increase (decrease) in number of ordinary shares issued Notes and other explanatory information [abstract] Cost of sales Cost of sales [Abstract] Cost of sales Purchase of non-current assets (tangibles and intangibles) Purchase of other long-term assets, classified as investing activities Intangible assets Intangible assets other than goodwill General Information Disclosure of general information about financial statements [text block] Types of share-based payment arrangements [domain] Types of share-based payment arrangements [domain] Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise (in gpb per share) Weighted average share price for share options in share-based payment arrangement exercised during period at date of exercise Number of administrative staff Average Number Of Administrative Staff Average Number Of Administrative Staff Proceeds from sublease Proceeds From Sublease Proceeds From Sublease REVENUE Revenue Revenue from contracts with customers Earnings per share [abstract] Earnings per share [abstract] Functional and Presentation Currency Description of accounting policy for functional currency [text block] Cash and cash equivalents Cash and cash equivalents at the beginning of the year Cash and cash equivalents at the end of the year Cash and cash equivalents Components of equity [axis] Components of equity [axis] Number and weighted average exercise price of share options Disclosure of number and weighted average remaining contractual life of outstanding share options [text block] Deferred tax liabilities Deferred tax liabilities (LOSS) / PROFIT BEFORE TAX Profit (loss) before tax Tax received / (paid) Income taxes paid (refund), classified as operating activities Other comprehensive income Other comprehensive income Basis of Consolidation Description Of Accounting Policy For Basis Of Consolidation [Policy Text Block] Description Of Accounting Policy For Basis Of Consolidation [Policy Text Block] Number of management staff Average Number Of Management Staff Average Number Of Management Staff Treasury shares Treasury shares [member] Identifiable assets acquired (liabilities assumed) Identifiable assets acquired (liabilities assumed) TOTAL LIABILITIES AND EQUITY Equity and liabilities Net change in cash and cash equivalents Increase (decrease) in cash and cash equivalents before effect of exchange rate changes Types of share-based payment arrangements [axis] Types of share-based payment arrangements [axis] Business combinations [axis] Business combinations [axis] Business combinations Business combinations [domain] ASSETS - CURRENT Current assets [abstract] Equity interests of acquirer Equity interests of acquirer Entity Address, Postal Zip Code Entity Address, Postal Zip Code Issue of new shares Issue of equity Revenue [abstract] ASSETS - NON-CURRENT Non-current assets [abstract] Tax on Profit on Ordinary Activities Disclosure of income tax [text block] Disclosure of detailed information about business combination [table] Disclosure of detailed information about business combination [table] Revenue Description of accounting policy for recognition of revenue [text block] Investment in own shares Investment In Own Share [Member] Investment In Own Share Number of share options expired in share-based payment arrangement (in shares) Number of share options expired in share-based payment arrangement Products and services Products and services [domain] Weighted average number of shares outstanding - Basic (in shares) Weighted average number of shares outstanding (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Other equity reserves Miscellaneous other reserves [member] Financial assets Current financial assets Other reserves Other reserves Borrowings Borrowings INVESTING ACTIVITIES Cash flows from (used in) investing activities [abstract] Grant income Adjustments for Government Grant Income Adjustments for Government Grant Income Disclosure of cash flow statement [Abstract] Disclosure of cash flow statement [Abstract] Disclosure of cash flow statement [Abstract] Statement of compliance Statement of IFRS compliance [text block] Net cash used in investing activities Cash flows from (used in) investing activities Repayment of borrowings Repayments of non-current borrowings Equity-settled share-based payment transactions - net of tax Increase (decrease) through share-based payment transactions, equity Net cash used in financing activities Cash flows from (used in) financing activities Use of Estimates and Judgments Description of Accounting Policy for Use of Estimates and Judgements [Policy Text Block] Description of Accounting Policy for Use of Estimates and Judgements [Policy Text Block] TOTAL Non-current assets Exchange differences on translating foreign operations and net investment hedge impact Other comprehensive income, net of tax, exchange differences on translation of foreign operations TMT TMT [Member] TMT [Member] Net changes in working capital Total changes in working capital Increase (decrease) in working capital TOTAL Current assets Mobility Mobility [Member] Mobility Investment in own shares Treasury shares Repayment of lease interest Payments Of Lease Interest Classified As Financing Activities Payments Of Lease Interest Classified As Financing Activities Disclosure of disaggregation of revenue from contracts with customers [line items] Disclosure of disaggregation of revenue from contracts with customers [line items] Statement of changes in equity [table] Statement of changes in equity [table] Transaction with owners Increase (decrease) through transactions with owners, equity Banking and Capital Markets Banking and Capital Markets [Member] Banking and Capital Markets Major ordinary share transactions Major ordinary share transactions [member] Rest of the world Rest Of World [Member] Rest Of World [Member] Merger relief reserve Merger reserve Net foreign exchange differences Effect of exchange rate changes on cash and cash equivalents Interest received Interest received, classified as investing activities Total cost of sales Cost of sales Net cash from operating activities Cash flows from (used in) operating activities Current Fiscal Year End Date Current Fiscal Year End Date Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Number of operational staff Average Number Of Operational Staff Average Number Of Operational Staff Summary of current tax Disclosure Of Major Components Of Tax Expense (Income) [Table Text Block] Disclosure Of Major Components Of Tax Expense (Income) [Table Text Block] LIABILITIES - NON CURRENT Non-current liabilities [abstract] Share-Based Payment Arrangements Disclosure of share-based payment arrangements [text block] CSOP Company Share Option Plan (“CSOP”) [Member] Company Share Option Plan (“CSOP”) [Member] Tax liabilities related to Pillar II Income tax Tax Liabilities Related To Pilar II Income Tax Tax Liabilities Related To Pilar II Income Tax Loss on disposal of right-of-use asset Gains (Losses) On Disposals Of Right-Of-Use Asset Gains (Losses) On Disposals Of Right-Of-Use Asset Loss on disposal of non-current assets (tangibles and intangibles) Adjustments for losses (gains) on disposal of non-current assets Geographical areas Geographical areas [domain] Corporation tax receivable Current tax assets, current Trade and other receivables Trade and other current receivables Non-cash adjustments Adjustments to reconcile profit (loss) [abstract] Deferred consideration Current Deferred Consideration Current Deferred Consideration Basis of Preparation Description Of Accounting Policy For Basis Of Preparation [Policy Text Block] Description Of Accounting Policy For Basis Of Preparation [Policy Text Block] Profit for the year Profit (loss) Contingent consideration Current Contingent Consideration Current Contingent Consideration UK research and development credit received Proceeds From Research And Development Credit Received Proceeds From Research And Development Credits Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] North America North America [Member] TOTAL Non-current liabilities The average number of staff employed by the group during the period (including directors): Number and average number of employees [abstract] Significant Accounting Policies Disclosure of material accounting policy information [text block] Operating Segment Analysis Disclosure of entity's operating segments [text block] Additional information [abstract] Retained earnings Retained earnings [member] Decrease in trade and other payables Adjustments for increase (decrease) in trade and other payables Entity Central Index Key Entity Central Index Key Non-cash adjustments Total non-cash adjustments Adjustments to reconcile profit (loss) other than changes in working capital Merger relief reserve Merger reserve [member] Share options outstanding at beginning of period (in shares) Share options outstanding at end of period (in shares) Number of share options outstanding in share-based payment arrangement Earnings Per Share Disclosure of earnings per share [text block] Trade and other payables Trade and other current payables Net changes in working capital Net changes in working capital [Abstract] Net changes in working capital [Abstract] Grant received Proceeds from government grants, classified as financing activities Europe Europe [Member] Document Information [Abstract] Document Information [Abstract] Document Information [Abstract] Healthcare Healthcare [Member] Healthcare Class35 Limited Class35 Limited [Member] Class35 Limited Lease liabilities Current lease liabilities OPERATING (LOSS) / PROFIT Profit (loss) from operating activities Items that may be reclassified subsequently to profit or loss: Exchange differences on translation [abstract] Entity Address, Address Line One Entity Address, Address Line One Cash transferred Cash transferred Options forfeited during the period (in shares) Number of share options forfeited in share-based payment arrangement Cancellation of shares Cancellation of treasury shares Diluted EPS (in gbp per share) Earnings per share - diluted (in gbp per share) Diluted earnings (loss) per share Proceeds from borrowings Proceeds from borrowings, classified as financing activities Repayment of lease liabilities Payments of lease liabilities, classified as financing activities Lease right-of-use assets Right-of-use assets Business combinations Disclosure of business combinations [text block] Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Customer-related intangible assets recognised as of acquisition date Customer-related intangible assets recognised as of acquisition date Effective tax rate Average effective tax rate Schedule of earnings per share Earnings per share [text block] Allocated cost of sales Cost Of Sales, Allocated Cost Of Sales, Allocated Entity Registrant Name Entity Registrant Name Basic EPS (in gbp per share) Earnings per share - basic (in gbp per share) Basic earnings (loss) per share Unrealised foreign exchange gain Adjustments for unrealised foreign exchange losses (gains) Statement of cash flows [abstract] Statement of cash flows [abstract] Fair value movement of financial liabilities Adjustments For Fair Value Gain (Loss) of Financial Liabilities Adjustments For Fair Value Gain (Loss) of Financial Liabilities Weighted average number of shares outstanding - Diluted (in shares) Weighted average number of shares outstanding (diluted) (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share