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Share-based payments - Additional information (Details) | Jun. 30, 2025 Options £ / shares | Dec. 31, 2024 Options £ / shares
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2021 Incentive Plan |  |
Share-based payments |  |
Number of options exercisable | Options | 1,023,239 | 380,763
2021 Incentive Plan | Maximum |  |
Share-based payments |  |
Exercise price of share options exercisable | £ 8.76 | £ 8.95
2021 Incentive Plan | Minimum |  |
Share-based payments |  |
Exercise price of share options exercisable | £ 0 | £ 0
EMI Scheme |  |
Share-based payments |  |
Number of options exercisable | Options | 682,767 | 635,240
Exercise price of share options exercisable | £ 1.68 |
EMI Scheme | Maximum |  |
Share-based payments |  |
Exercise price of share options exercisable |  | £ 11.49
EMI Scheme | Minimum |  |
Share-based payments |  |
Exercise price of share options exercisable |  | £ 1.84

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- Definition The number of share options exercisable in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_vii&doctype=Standard -URIDate 2024-03-27 + Details
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