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Financial risk management objectives and policies - Analysis of Financial Assets and Liabilities (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | £ 398 | £ 333 | £ 370
Deferred income and customer advances | 1,160 | 1,319 |
Borrowings | (4,328) | (4,721) |
Derivative liabilities | (52) | 31 |
Contingent consideration liabilities | (133) | (199) |
Liabilities in respect of put options | (67) | (104) |
Derivatives in designated hedge relationships | Classification under IFRS 9 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 4 | 31 |
Derivative liabilities | (55) | 0 |
Financial instruments | (51) | 31 |
Held at fair value through profit or loss | Classification under IFRS 9 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 1 | 2 |
Other investments | 306 | 258 |
Cash and cash equivalents | 655 | 181 |
Derivative liabilities | (2) | (2) |
Contingent consideration liabilities | (133) | (199) |
Financial instruments | 827 | 240 |
Held at fair value through other comprehensive income | Classification under IFRS 9 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 92 | 75 |
Financial instruments | 92 | 75 |
Amortised cost | Classification under IFRS 9 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade and other receivables | 10,197 | 10,719 |
Cash and cash equivalents | 1,983 | 2,037 |
Trade and other payables | (10,912) | (10,919) |
Deferred income and customer advances | (1,160) | (1,319) |
Borrowings | (4,328) | (4,721) |
Liabilities in respect of put options | (67) | (104) |
Financial instruments | (4,287) | (4,307) |
Carrying value | Classification under IFRS 9 |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Trade and other receivables | 10,197 | 10,719 |
Derivative assets | 5 | 33 |
Other investments | 398 | 333 |
Cash and cash equivalents | 2,638 | 2,218 |
Trade and other payables | (10,912) | (10,919) |
Deferred income and customer advances | (1,160) | (1,319) |
Borrowings | (4,328) | (4,721) |
Derivative liabilities | (57) | (2) |
Contingent consideration liabilities | (133) | (199) |
Liabilities in respect of put options | (67) | (104) |
Financial instruments | £ (3,419) | £ (3,961) |

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