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Fair value estimation - Financial instruments (Details) - GBP (£) £ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Fair value estimation |  |
Current derivative financial assets |  | £ 2
Non-current derivative financial assets | £ 21 | 10
Current derivative financial liabilities |  | (1)
Non-current derivative financial liabilities | (92) | (34)
Contingent consideration liability, non-current | (38) | (52)
Contingent consideration | (70) | (75)
Interest rate swaps |  |
Fair value estimation |  |
Derivative financial assets | 21 | 12
Derivative financial liabilities | 92 | 35
Foreign exchange swaps |  |
Fair value estimation |  |
Notional amount | 17 | 39
Foreign exchange forwards |  |
Fair value estimation |  |
Notional amount | 0 | 34
Level 2 |  |
Fair value estimation |  |
Current derivative financial assets |  | 2
Non-current derivative financial assets | 51 | 10
Derivative financial assets | 51 | 12
Current derivative financial liabilities |  | (1)
Non-current derivative financial liabilities | (122) | (34)
Derivative financial liabilities | (122) | (35)
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 |  | (1)
Level 2 | Cash flow hedge | Interest rate swaps |  |
Fair value estimation |  |
Derivative financial assets | 36 |
Derivative financial liabilities | (2) | (25)
Level 2 | Net investment hedge | Interest rate swaps |  |
Fair value estimation |  |
Derivative financial assets | 15 | 11
Derivative financial liabilities | (120) | (8)
Level 3 |  |
Fair value estimation |  |
Contingent consideration liability, current | (32) | (23)
Contingent consideration liability, non-current | (38) | (52)
Contingent consideration | £ (70) | £ (75)

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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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of current derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + 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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + Details
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