Trade receivables - Summary of Trade Receivables (Details) - GBP (£) £ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Trade And Other Receivables [Abstract]
Trade receivables	£ 331	£ 29,306

The amount due from customers for goods and services sold.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 78
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant