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Fair value estimation - Contingent consideration (Details) - Contingent consideration - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair value estimation |  |
Balance at the beginning | £ 76 | £ 70
Exchange differences | (1) | (3)
Acquisitions | 31 | 41
Payments | (25) | (28)
Unused amount reversed | (7) |
Revaluation of put option through equity | 1 | (4)
Balance at the end | £ 75 | £ 76

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- Definition The increase in fair value measurement of liabilities resulting from issues of those liabilities. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The decrease in the fair value measurement of liabilities resulting from settlements. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2024-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2024-03-27 + Details
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