Deferred tax - Analysis of the deferred tax (Details) - GBP (£) £ in Thousands	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Analysis of deferred tax
Net deferred tax assets	£ 24,927	£ 17,607	£ (3,304)
UK
Analysis of deferred tax
Net deferred tax assets	£ 24,927	£ 17,607	£ (3,304)

The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2024-01-01
-Paragraph 81
-Subparagraph g
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_DeferredTaxLiabilityAsset
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant