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Derivative financial instruments - Cash flow hedge - Narrative (Details) € in Millions, £ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 GBP (£) | Dec. 31, 2023 GBP (£) | Dec. 31, 2022 GBP (£) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€)
Derivative financial instruments |  |  |  |  |  |
Net gain/(loss) on cash flow hedge | £ | [1] | £ 27 | £ 3 | £ (6) |  |
Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Hedge ratio |  | 1 |  |  |  |
Gain or (loss) due to ineffectiveness | £ |  | £ (2) | 1 |  |  |
Gain (loss) in hedge reserves related to continuing hedges | £ |  | 34 | 6 | 3 |  |
Gain (loss) in hedge reserves related to discontinued hedges | £ |  | 0 | 0 | 0 |  |
Bonds €500m, €850m, €600m | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Net gain/(loss) on cash flow hedge | £ |  | £ 27 | £ 3 | £ (6) |  |
€500m bond maturing in 2026 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | € 500 | € 500
Principal amount |  |  |  |  | 500 |
€850m bond maturing in 2027 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | 421 | 421
Principal amount |  |  |  |  | 850 |
€600m bond maturing in 2028 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | 600 | € 600
Principal amount |  |  |  |  | € 600 |
[1] | £27m net gain (2023: £3m net gain; 2022: £6m net loss) on cash flow hedge includes a £51m loss (2023: £28m loss; 2022: £137m gain) from the effective portion of changes in fair value, offset by reclassification to the cost of acquisition of £nil (2023: £nil; 2022: £118m loss) and a £78m gain (2023: £31m gain; 2022: £25m loss) reclassification to the income statement due to changes in foreign exchange rates.

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- Definition The gain (loss) recognised in profit or loss on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of other comprehensive income, before tax, after reclassification adjustments, related to cash flow hedges. [Refer: Cash flow hedges [member]; Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_91_b&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard -URIDate 2024-03-27 + Details
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