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Finance and investment income, finance costs and revaluation and retranslation of financial instruments - Summary of Finance Income, Finance Costs and Revaluation and Retranslation of Financial Instruments (Details) - GBP (£) £ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Analysis of income and expense [abstract] |  |  |
Financial assets measured at fair value through profit and loss | £ 123 | £ 111 | £ 118
Financial assets measured at fair value through profit and loss | 11 | 13 | 24
Other interest income | 3 | 3 | 3
Finance and investment income | 137 | 127 | 145
Interest on bank overdrafts, bonds and bank loans | 309 | 273 | 258
Interest expense related to lease liabilities | 98 | 106 | 96
Interest on other long-term employee benefits | 6 | 6 | 3
Net interest expense on pension plans | 4 | 4 | 2
Finance costs | 417 | 389 | 359
Movements in fair value of derivative financial instruments | (17) | (3) | 1
Premium on the early repayment of bonds | (16) | 0 | 0
Revaluation of investments and other assets held at fair value through profit or loss | (24) | (21) | 23
Remeasurement of put options over non-controlling interests | (10) | (1) | 28
Revaluation of contingent consideration liabilities | 1 | 51 | 26
Retranslation of financial instruments | 16 | (19) | (2)
Net revaluation and retranslation of financial instrument (loss)/gain | £ (50) | £ 7 | £ 76

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- Definition The gains (losses) on financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 20 -Subparagraph a -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_20_a_vi&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest expense on borrowings. [Refer: Interest expense; Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2024-01-01 -Paragraph 53 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest income on other financial assets. [Refer: Interest income; Other financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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