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Financial risk management objectives and policies - Financial instruments at Fair Value (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | £ 2,638 | £ 2,218 | £ 2,492
Other investments | 398 | 333 | £ 370
Derivative liabilities | (52) | 31 |
Contingent consideration liabilities | (133) | (199) |
Derivatives in designated hedge relationships | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | (55) | 0 |
Derivatives in designated hedge relationships | Level 1 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 0 | 0 |
Derivatives in designated hedge relationships | Level 2 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | (55) | 0 |
Derivatives in designated hedge relationships | Level 3 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 0 | 0 |
Held at fair value through profit or loss | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | (2) | (2) |
Held at fair value through profit or loss | At Fair Value | Contingent consideration liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration liabilities | (133) | (199) |
Held at fair value through profit or loss | Level 1 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 0 | 0 |
Held at fair value through profit or loss | Level 1 | At Fair Value | Contingent consideration liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration liabilities | 0 | 0 |
Held at fair value through profit or loss | Level 2 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | (2) | (2) |
Held at fair value through profit or loss | Level 2 | At Fair Value | Contingent consideration liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration liabilities | 0 | 0 |
Held at fair value through profit or loss | Level 3 | At Fair Value | Derivative liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative liabilities | 0 | 0 |
Held at fair value through profit or loss | Level 3 | At Fair Value | Contingent consideration liabilities |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Contingent consideration liabilities | (133) | (199) |
Money market funds | Held at fair value through profit or loss | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 655 | 181 |
Money market funds | Held at fair value through profit or loss | Level 1 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 655 | 181 |
Money market funds | Held at fair value through profit or loss | Level 2 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Money market funds | Held at fair value through profit or loss | Level 3 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Cash and cash equivalents | 0 | 0 |
Other investments | Held at fair value through profit or loss | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 306 | 258 |
Other investments | Held at fair value through profit or loss | Level 1 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 73 | 1 |
Other investments | Held at fair value through profit or loss | Level 2 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 0 | 0 |
Other investments | Held at fair value through profit or loss | Level 3 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 233 | 257 |
Other investments | Other investments | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 92 | 75 |
Other investments | Other investments | Level 1 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 3 | 7 |
Other investments | Other investments | Level 2 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 0 | 0 |
Other investments | Other investments | Level 3 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Other investments | 89 | 68 |
Derivative assets | Derivatives in designated hedge relationships | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 4 | 31 |
Derivative assets | Derivatives in designated hedge relationships | Level 1 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 0 | 0 |
Derivative assets | Derivatives in designated hedge relationships | Level 2 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 4 | 31 |
Derivative assets | Derivatives in designated hedge relationships | Level 3 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 0 | 0 |
Derivative assets | Held at fair value through profit or loss | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 1 | 2 |
Derivative assets | Held at fair value through profit or loss | Level 1 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 0 | 0 |
Derivative assets | Held at fair value through profit or loss | Level 2 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | 1 | 2 |
Derivative assets | Held at fair value through profit or loss | Level 3 | At Fair Value |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Derivative assets | £ 0 | £ 0 |

X
- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of investments other than investments accounted for using the equity method. [Refer: Investments accounted for using equity method] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard -URIDate 2024-03-27 + Details
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