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Taxation - Current taxation (Details) - GBP (£)
£ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
Standard rate of corporation tax 25.00% 19.00% 19.00%  
UNITED KINGDOM        
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]        
UK corporation tax     £ (4) £ 30