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v3.23.2

Share-based payments (Details) £ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 GBP (£) shares | Jun. 30, 2023 shares $ / shares | Jun. 30, 2022 GBP (£) shares | Jun. 30, 2022 shares $ / shares | Jun. 30, 2023 GBP (£) shares | Jun. 30, 2023 shares $ / shares | Jun. 30, 2022 GBP (£) shares | Jun. 30, 2022 shares $ / shares
Share-based payments awards [Abstract] |  |  |  |  |  |  |  |
Share-based payments | £ | £ 6,990 |  | £ 6,675 |  | £ 13,651 |  | £ 14,088 |
Awards granted, number of share options (in shares) | 48,980 |  | 180,621 |  | 742,105 |  | 1,363,653 |
Share-based compensation arrangement by award vesting period |  |  |  |  | 4 years |  |  |
Share-based compensation arrangement by award vesting percentage |  |  |  |  | 0.25 |  |  |
Vesting period |  |  |  |  | 3 years |  |  |
Weighted average fair value and exercise prices of options granted [Abstract] |  |  |  |  |  |  |  |
Weighted average exercise price (in dollars per share) | $ / shares |  | $ 57.51 |  | $ 28.86 |  | $ 63.94 |  | $ 25.47
Weighted average fair value (in dollars per share) | $ / shares |  | 35.14 |  | $ 17.91 |  | 39.52 |  | $ 15.62
Options exercised during the period (in shares) | 561,940 |  |  |  | 853,003 |  |  |
Weighted average exercise price (in dollars per share) | $ / shares |  | $ 20.48 |  |  |  | $ 20.64 |  |
Number of share options outstanding (in shares) | 9,739,383 | 9,739,383 | 10,174,957 | 10,174,957 | 9,739,383 | 9,739,383 | 10,174,957 | 10,174,957
Number of share options exercisable (in shares) | 5,474,272 | 5,474,272 | 4,358,536 | 4,358,536 | 5,474,272 | 5,474,272 | 4,358,536 | 4,358,536
Non-Executive Directors [Member] |  |  |  |  |  |  |  |
Share-based payments awards [Abstract] |  |  |  |  |  |  |  |
Awards granted, number of share options (in shares) | 43,380 |  |  |  |  |  |  |
Share-based compensation arrangement by award vesting period |  |  |  |  | 1 year |  |  |

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