Leases - Movement in lease liabilities (Details) - GBP (£) £ in Thousands	6 Months Ended
Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Lease liabilities
Beginning balance	£ 4,430	£ 3,757	£ 4,340
Cash flows	(1,515)	(576)	(868)
Additions	300	1,202	235
Accretion expense	64	47	50
Ending balance	£ 3,279	£ 4,430	£ 3,757

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2021-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2021-03-24

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