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Derivative financial instruments - Net investment hedge (Details) - Net investment hedge € in Millions, £ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 GBP (£) $ / £ USD ($) ¥ / £ € / £ EUR (€) | Dec. 31, 2023 GBP (£) $ / £ EUR (€) € / £ USD ($) ¥ / £ | Dec. 31, 2022 GBP (£)
Derivative financial instruments |  |  |
Hedge ratio | 1 |  |
Ineffectiveness | £ 0 | £ 0 |
Gain (loss) in net investment hedge reserves related to continuing hedges | 6 | 16 | £ (91)
Gain (loss) in net investment hedge reserves related to discontinued hedges | (7) | 0 | £ 0
Cross-currency swaps | US dollar |  |  |
Derivative financial instruments |  |  |
Carrying amount | £ 4 | £ 9 |
Notional amount | (1,300) | (1,641) |
Hedge ratio | 1 | 1 |
Change in fair value of outstanding instrument | £ (5) | £ 114 |
Change in fair value of hedged item | £ (5) | £ 114 |
Weighted average foreign exchange rate for the year | $ / £ | 1.241 | 1.25 |
Cross-currency swaps | JPY |  |  |
Derivative financial instruments |  |  |
Carrying amount |  | £ 1 |
Notional amount | (10) | (11) |
Hedge ratio | 1 | 1 |
Change in fair value of outstanding instrument | £ (1) | £ 1 |
Change in fair value of hedged item | £ (1) | £ 1 |
Weighted average foreign exchange rate for the year | ¥ / £ | 169.747 | 167.269 |
Bonds | Euro |  |  |
Derivative financial instruments |  |  |
Carrying amount | £ (261) | £ (298) |
Notional amount | (315) | (343) |
Hedge ratio | 1 | 1 |
Change in fair value of outstanding instrument | £ 16 | £ 6 |
Change in fair value of hedged item | £ 16 | £ 6 |
Weighted average foreign exchange rate for the year | € / £ | 1.162 | 1.162 |
Term loan | US dollar |  |  |
Derivative financial instruments |  |  |
Carrying amount | £ (436) | £ (360) |
Notional amount | (546) | (459) |
Hedge ratio | 1 | 1 |
Change in fair value of outstanding instrument | £ 6 | £ 9 |
Change in fair value of hedged item | £ 6 | £ 9 |
Weighted average foreign exchange rate for the year | $ / £ | 1.11 | 1.11 |

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- Definition The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_a_iv&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24B -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24B_b_i&doctype=Standard -URIDate 2024-03-27 + Details
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