Income Tax - Schedule of Major Components of Income Tax Credit (Detail) - GBP (£) £ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
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| Current tax: | ||||
| Total current tax | £ 325 | £ 1,260 | £ 672 | £ 2,553 |
| Deferred tax: | ||||
| Income tax credit | 328 | 1,272 | 681 | 2,577 |
| U.K. [member] | ||||
| Current tax: | ||||
| In respect of current period | 301 | 1,260 | 648 | 2,532 |
| In respect of prior period | 24 | 0 | 24 | 22 |
| U.S. [member] | ||||
| Current tax: | ||||
| In respect of current period | 0 | (1) | ||
| Deferred tax: | ||||
| In respect of current period | £ 3 | £ 12 | £ 9 | 24 |
| In respect of prior period | £ 0 | |||
| X | ||||||||||
- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Adjustments of tax expense (income) recognised in the period for the deferred tax of prior periods. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The amount of income taxes payable (recoverable) in respect of the taxable profit (tax loss) for a period. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition The amount of current tax expense (income) and adjustments for the current tax of prior periods. [Refer: Current tax expense (income); Adjustments for current tax of prior periods] Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition The aggregate amount included in the determination of profit (loss) for the period in respect of current tax and deferred tax. [Refer: Current tax expense (income); Deferred tax expense (income)] Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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- Details
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