Financial risk management - Credit risk (Details) - GBP (£)	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Disclosure of gross trade receivables by due date and impairment
Number of days for payment that specific agreements may go beyond	30 days
Trade receivables	£ 177,147,000	£ 64,929,000
Transfer fees receivable	£ 102,614,000	59,845,000
Percentage of provision for trade receivables that are past due and impaired	100.00%
Minimum
Disclosure of gross trade receivables by due date and impairment
Credit term for other sales	14 days
Maximum
Disclosure of gross trade receivables by due date and impairment
Credit term for other sales	30 days
Cost / gross value
Disclosure of gross trade receivables by due date and impairment
Trade receivables	£ 197,532,000	75,914,000
Trade receivables \| Cost / gross value
Disclosure of gross trade receivables by due date and impairment
Financial assets	197,532,000	75,914,000
Trade receivables \| Cost / gross value \| Not impaired \| Not past due
Disclosure of gross trade receivables by due date and impairment
Financial assets	157,747,000	49,537,000
Trade receivables \| Cost / gross value \| Not impaired \| Past due
Disclosure of gross trade receivables by due date and impairment
Financial assets	19,400,000	15,392,000
Trade receivables \| Cost / gross value \| Impaired \| Not past due
Disclosure of gross trade receivables by due date and impairment
Financial assets		260,000
Trade receivables \| Cost / gross value \| Impaired \| Past due
Disclosure of gross trade receivables by due date and impairment
Financial assets	£ 20,385,000	£ 10,725,000

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Classes of financial instruments [domain]; Financial liabilities]

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