Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£) £ in Thousands	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the year	£ (203,975)	£ (176,283)
Recognized in revenue during the year	198,628	178,853
Cash received/amounts invoiced during the year	(206,058)	(206,545)
Contract liabilities - deferred revenue at end of the year	(211,405)	(203,975)
Current contract assets and contract liabilities
Revenue from contracts with customers
Contract assets - accrued revenue at beginning of the year	39,778	43,332
Recognized in revenue during the year	19,528	49,536
Cash received/amounts invoiced during the year	(39,778)	(53,090)
Contract assets - accrued revenue at end of the year	19,528	39,778
Contract liabilities - deferred revenue at beginning of the year	(198,628)	(169,624)
Recognized in revenue during the year	198,628	178,853
Cash received/amounts invoiced during the year	(206,058)	(206,545)
Reclassified between current and non-current during the year	568	(1,312)
Contract liabilities - deferred revenue at end of the year	(205,490)	(198,628)
Non-current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the year	(5,347)	(6,659)
Reclassified between current and non-current during the year	(568)	1,312
Contract liabilities - deferred revenue at end of the year	£ (5,915)	£ (5,347)

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 2024-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_105&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2024-01-01
-Paragraph 116
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2024-03-27

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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
-Number 15
-IssueDate 2024-01-01
-Paragraph 118
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_118_e&doctype=Standard
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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.

+ References

No definition available.

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- Definition

Decrease through cash received or amounts invoiced, contract assets

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Increase through cash received or amounts invoiced, contract liability

+ References

No definition available.

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- Definition

Increase in contract assets through revenue recognized

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No definition available.

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