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Share-based Payments - Disclosure of RSU activity (Details) - RSU
 12 Months Ended
Dec. 31, 2022
shares
£ / shares
Dec. 31, 2021
shares
£ / shares
Dec. 31, 2020
shares
£ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding (Non-vested), beginning of year (in shares) | shares 3,632,715 3,422,582 4,636,347
Granted (in shares) | shares 4,309,883 2,195,133 1,759,011
Vested (in shares) | shares (696,398) (1,176,695) (2,781,687)
Forfeited (in shares) | shares (1,155,420) (808,305) (191,089)
Outstanding (Non-vested), end of year (in shares) | shares 6,090,780 3,632,715 3,422,582
Weighted average grant date fair value, RSU outstanding beginning balance (in GBP per share) | £ / shares £ 1.91 £ 2.46 £ 2.08
Weighted average grant date fair value, RSU granted (in GBP per share) | £ / shares 1.76 2.15 1.80
Weighted average grant date fair value, RSU vested (in GBP per share) | £ / shares 2.80 2.93 1.54
Weighted average grant date fair value, RSU forfeited (in GBP per share) | £ / shares 2.67 2.25 2.37
Weighted average grant date fair value, RSU Ending balance (in GBP per share) | £ / shares £ 1.74 £ 1.91 £ 2.46