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Critical accounting judgements and key sources of estimation uncertainty (Details) £ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 10, 2021 GBP (£) shares | Dec. 31, 2021 GBP (£) | Dec. 31, 2021 | Dec. 31, 2021 $ / shares | Dec. 31, 2021 Y | Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of shares exchangeable upon closing of merger | shares | 6,125,000 |  |  |  |  |
Expense recognised | £ |  | £ 111,996 |  |  |  |
Exercise price | $ / shares |  |  |  | $ 18 |  |
Vesting period in years |  |  | 4 |  | 4 | 1
Percentage of common shares subject to call option exercisable |  |  | 50.00% |  |  |
Issuance of Class Z shares to American |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |
Number of shares exchangeable upon closing of merger | shares | 6,125,000 |  |  |  |  |
Expense recognised | £ | £ 16,739 | £ 16,739 |  |  |  |

X
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