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Taxation - Reconciliation (Details) - GBP (£)
£ in Thousands
 1 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Taxation        
Loss before tax £ 50 £ (245,224) £ (12,322) £ (7,514)
Corporation tax benefit at standard rate   46,593 2,341 1,428
Decrease in tax benefit from effect of expenses not deductible in determining taxable profit (tax loss)   (92) (135)  
Decrease in tax benefit from tax losses for which no deferred tax asset was recognized   £ (46,501) (841)  
Decrease in tax benefit arising from group relief tax reconciliation (pre Reorganization)     (1,369) (1,428)
Deferred tax credit from unrecognised temporary difference from a prior period       30
Total tax (expense)/benefit     £ (4) £ 30