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Share-based Payments - Disclosure of range of exercise prices of outstanding share options (Details) | 12 Months Ended
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Dec. 31, 2022 shares £ / shares | Dec. 31, 2021 shares £ / shares | Dec. 31, 2020 shares £ / shares | Dec. 31, 2019 shares £ / shares
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share options (in shares) | shares | 17,793,881 | 13,414,118 | 10,916,086 | 8,472,827
Wtd Average Exercise Price (in GBP per share) | £ 2.31 | £ 2.58 | £ 1.81 | £ 1.16
Weighted average remaining contractual life of outstanding share options (in years) | 8 years 10 days | 8 years 3 months 14 days | 8 years 4 months 17 days | 8 years 6 months 18 days
0.01 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | £ 0.01 |  |  |
Number of share options (in shares) | shares | 439,490 |  |  |
Wtd Average Exercise Price (in GBP per share) | £ 0 |  |  |
Weighted average remaining contractual life of outstanding share options (in years) | 6 years 9 months 3 days |  |  |
1.00 to 2.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share options (in shares) | shares | 6,276,391 |  |  |
Wtd Average Exercise Price (in GBP per share) | £ 1.58 |  |  |
Weighted average remaining contractual life of outstanding share options (in years) | 7 years |  |  |
2.00 to 3.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share options (in shares) | shares | 5,375,750 |  |  |
Wtd Average Exercise Price (in GBP per share) | £ 2.26 |  |  |
Weighted average remaining contractual life of outstanding share options (in years) | 8 years 11 months 1 day |  |  |
3.00 to 4.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Number of share options (in shares) | shares | 5,702,250 |  |  |
Wtd Average Exercise Price (in GBP per share) | £ 3.34 |  |  |
Weighted average remaining contractual life of outstanding share options (in years) | 8 years 4 months 24 days |  |  |
Bottom of range | 1.00 to 2.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | £ 1.00 |  |  |
Bottom of range | 2.00 to 3.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | 2.00 |  |  |
Bottom of range | 3.00 to 4.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | 3.00 |  |  |
Top of range | 1.00 to 2.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | 2.00 |  |  |
Top of range | 2.00 to 3.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | 3.00 |  |  |
Top of range | 3.00 to 4.00 |  |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |  |
Range of Exercise Prices (in GBP per share) | £ 4.00 |  |  |

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