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Provisions (Details) - Dilapidation Provision - GBP (£)
£ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
As at January 1 £ 88 £ 83
Unwinding of discount 7 5
As at December 31 £ 95 £ 88