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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, 2022 GBP (£) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 GBP (£) | Dec. 31, 2022 EUR (€) | Dec. 31, 2021 EUR (€)
Derivative financial instruments |  |  |  |  |  |
Net gain (loss) on cash flow hedge | £ | [1] | £ (6) | £ 13 | £ (5) |  |
Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Hedge ratio |  | 1 |  |  |  |
Gain or (loss) due to ineffectiveness | £ |  | £ 21 | (1) |  |  |
Net gain (loss) on cash flow hedge | £ |  | (6) | 13 |  |  |
Gain in hedge reserves related to continuing hedges | £ |  | 3 | 9 |  |  |
Gain in hedge reserves related to discontinued hedges | £ |  | £ 0 | £ 0 |  |  |
€400m bond maturing in 2024 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | € 400 | € 340
Principal amount |  |  |  |  | 400 |
€500m bond maturing in 2026 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | 500 | 179
Principal amount |  |  |  |  | 500 |
€850m bond maturing in 2027 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | 421 | 0
Principal amount |  |  |  |  | 850 |
€600m bond maturing in 2028 | Cash flow hedge |  |  |  |  |  |
Derivative financial instruments |  |  |  |  |  |
Amount of hedged item |  |  |  |  | 600 | € 175
Principal amount |  |  |  |  | € 600 |
[1] | £6m net loss (2021: £13m net gain; 2020: £5m net loss) on cash flow hedge includes £137m gain (2021: £15m loss; 2020: £15m gain) from the effective portion of changes in fair value offset by reclassification to the cost of acquisition of £118m gain (2021: £nil; 2020: £nil) and reclassification to the income statement of £25m gain (2021: £28m loss; 2020: £20m gain) 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 2022-03-24 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24C -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_24C_b_ii&doctype=Standard -URIDate 2022-03-24 + Details
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