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Fair value estimation - Contingent consideration (Details) - Contingent consideration - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Fair value estimation |  |
Balance at the beginning | £ 75 | £ 63
Exchange differences | (2) | (8)
Acquisitions | 18 | 24
Payments | (24) | (12)
Revaluation of put option through equity | 3 | 8
Balance at the end | £ 70 | £ 75

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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 2022-03-24 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 93 -Subparagraph e -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2022-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2022-03-24 + Details
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