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Fair value estimation - Financial instruments (Details) - GBP (£) £ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Fair value estimation |  |
Current derivative financial assets |  | £ 14
Non-current derivative financial assets | £ 6 | 57
Derivative financial assets | 6 | 71
Current derivative financial liabilities | (3) | (32)
Non-current derivative financial liabilities | (29) | (16)
Derivative financial liabilities | (32) | (48)
Contingent consideration liability, non-current | (38) | (40)
Contingent consideration | (75) | (76)
Foreign exchange swaps |  |
Fair value estimation |  |
Effective nominal value | (45) | 27
Level 2 |  |
Fair value estimation |  |
Current derivative financial assets |  | 5
Non-current derivative financial assets | 24 | 57
Derivative financial assets | 24 | 62
Current derivative financial liabilities | (3) | (23)
Non-current derivative financial liabilities | (47) | (16)
Derivative financial liabilities | (50) | (39)
Level 2 | Non-hedge | Interest rate swaps |  |
Fair value estimation |  |
Derivative financial liabilities |  | (1)
Level 2 | Non-hedge | Foreign exchange swaps |  |
Fair value estimation |  |
Derivative financial assets |  | 1
Derivative financial liabilities | (3) |
Level 2 | Net investment hedge | Interest rate swaps |  |
Fair value estimation |  |
Derivative financial assets | 23 | 37
Derivative financial liabilities | (19) | (27)
Level 2 | Cash flow hedge | Interest rate swaps |  |
Fair value estimation |  |
Derivative financial assets | 1 | 24
Derivative financial liabilities | (28) | (11)
Level 3 |  |
Fair value estimation |  |
Contingent consideration liability, current | (37) | (36)
Contingent consideration liability, non-current | (38) | (40)
Contingent consideration | £ (75) | £ (76)

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- Definition The amount of current derivative financial assets. [Refer: Derivative financial assets] + 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 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 non-current derivative financial assets. [Refer: Derivative financial assets] + 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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