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Income tax credit (Details) - GBP (£) £ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Income tax credit |  |  |
Amount of credit (reversal) from R&D | £ 366 | £ (7,553) | £ 740
Adjustments for R&D tax relief of prior periods |  | £ 13,700 |

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- Definition Amount of credit (reversal) from research and development expenditure credit scheme. + References No definition available. + Details
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Balance Type: | credit
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- References No definition available. + Details
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- Definition The amount of benefit arising from a previously unrecognised tax loss, tax credit or temporary difference of a prior period that is used to reduce current tax expense. [Refer: Temporary differences [member]; Unused tax losses [member]; Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 80 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_80_e&doctype=Standard -URIDate 2024-03-27 + Details
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