Trade receivables - Additional Information (Details) - GBP (£)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2021
Trade And Other Receivables [Abstract]
Interest on outstanding receivables		£ 0
Overdue trade receivables		£ 0
Provision required due to expected credit loss model

The amount of interest recognised as a receivable.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_InterestReceivable
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant