Revenue from contracts with customers - Assets and liabilities related to contracts with customers (Details) - GBP (£) £ in Thousands	6 Months Ended
Dec. 31, 2024	Jun. 30, 2024	Dec. 31, 2023
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the period	£ (203,975)	£ (157,702)	£ (176,283)
Recognized in revenue during the period	146,080	126,256	134,384
Cash received/amounts invoiced during the period	(111,975)	(172,529)	(115,803)
Contract liabilities - deferred revenue at end of the period	(169,870)	(203,975)	(157,702)
Current contract assets and contract liabilities
Revenue from contracts with customers
Contract assets - accrued revenue at beginning of the period	39,778	61,819	43,332
Recognized in revenue during the period	94,657	38,994	105,882
Cash received/amounts invoiced during the period	(74,588)	(61,035)	(87,395)
Contract assets - accrued revenue at end of the period	59,847	39,778	61,819
Contract liabilities - deferred revenue at beginning of the period	(198,628)	(149,643)	(169,624)
Recognized in revenue during the period	146,080	126,256	134,384
Cash received/amounts invoiced during the period	(111,975)	(172,529)	(115,803)
Reclassified between current and non-current during the period	(1,201)	(2,712)	1,400
Contract liabilities - deferred revenue at end of the period	(165,724)	(198,628)	(149,643)
Non-current contract assets and contract liabilities
Revenue from contracts with customers
Contract liabilities - deferred revenue at beginning of the period	(5,347)	(8,059)	(6,659)
Reclassified between current and non-current during the period	1,201	2,712	(1,400)
Contract liabilities - deferred revenue at end of the period	£ (4,146)	£ (5,347)	£ (8,059)

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 2023-01-01
-Paragraph 105
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_105&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 116
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2023-03-23

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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 [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 15
-IssueDate 2023-01-01
-Paragraph 118
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2023-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

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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

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- Definition

Increase in contract assets through revenue recognized

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