Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£) £ in Thousands	12 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the year	£ (211,405)	£ (203,975)
Recognized in revenue during the year	205,490	198,628
Cash received/amounts invoiced during the year	(207,578)	(206,058)
Contract liabilities - deferred revenue at end of the year	(213,493)	(211,405)
Current contract assets and contract liabilities
Revenue from contracts with customers
Contract assets - accrued revenue at beginning of the year	19,528	39,778
Recognized in revenue during the year	26,446	19,528
Cash received/amounts invoiced during the year	(18,811)	(39,778)
Contract assets - accrued revenue at end of the year	27,163	19,528
Contract liabilities - deferred revenue at beginning of the year	(205,490)	(198,628)
Recognized in revenue during the year	205,490	198,628
Cash received/amounts invoiced during the year	(207,578)	(206,058)
Reclassified between current and non-current during the year	(3,236)	568
Contract liabilities - deferred revenue at end of the year	(210,814)	(205,490)
Non-current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the year	(5,915)	(5,347)
Reclassified between current and non-current during the year	3,236	(568)
Contract liabilities - deferred revenue at end of the year	£ (2,679)	£ (5,915)

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2025-01-01
-Paragraph 105
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-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2025-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph 105
-Subparagraph a
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-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

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- Definition

The decrease in contract liabilities resulting from the performance obligation being satisfied. [Refer: Contract liabilities; Performance obligations [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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Decrease through cash received or amounts invoiced, contract assets

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Increase (decrease) in contract liability through reclassification between current and non-current

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Increase through cash received or amounts invoiced, contract liability

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Increase in contract assets through revenue recognized

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