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Financial risk management objectives and policies - Risk Exposure (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Currency and interest rate risk | Fair value hedges of foreign currency and interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedge ineffectiveness (loss)/gain | £ (3) | £ 0
Fair value (loss)/gain arising on hedging instruments deferred to OCI | 0 | 0
Fair value amounts reclassified to profit and loss | £ 0 | £ 0
Weighted average interest rate |  | 0.00%
Weighted average FX rate | 1.17 | 0
Currency and interest rate risk | Hedging Instruments | Fair value hedges of foreign currency and interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | £ (15) | £ 0
Notional amount of hedged items | £ 0 | £ 0
Notional amount of hedging instruments | 500 | 0
Change in fair value of hedging instrument (loss)/gain | £ (7) | £ 0
Currency and interest rate risk | Non-Derivative Hedging Instrument | Fair value hedges of foreign currency and interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | 0 | 0
Currency and interest rate risk | Hedged Items | Fair value hedges of foreign currency and interest rate risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of hedged items | 500 | 0
Change in fair value of hedged items gain/(loss) | 4 | 0
Currency risk | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedge ineffectiveness (loss)/gain | (3) | 3
Fair value (loss)/gain arising on hedging instruments deferred to OCI | (35) | (43)
Fair value amounts reclassified to profit and loss | £ 58 | £ 44
Weighted average interest rate | 4.45% | 4.43%
Weighted average FX rate | 1.14 | 1.13
Currency risk | Net investment hedges of foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedge ineffectiveness (loss)/gain | £ 0 | £ 2
Fair value (loss)/gain arising on hedging instruments deferred to OCI | (3) | 108
Fair value amounts reclassified to profit and loss | £ 0 | £ 0
Weighted average interest rate | 5.24% | 4.62%
Weighted average FX rate | 1.24 | 1.23
Currency risk | Hedging Instruments | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | £ (56) | £ (17)
Notional amount of hedged items | £ 0 | £ 0
Notional amount of hedging instruments | 1,400 | 1,250
Change in fair value of hedging instrument (loss)/gain | £ (5) | £ (29)
Currency risk | Hedging Instruments | Net investment hedges of foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, assets | 20 | 48
Notional amount of hedged items | £ 1,285 | £ 1,874
Notional amount of hedging instruments | 1,285 | 1,874
Change in fair value of hedging instrument (loss)/gain | £ (3) | £ 110
Currency risk | Non-Derivative Hedging Instrument | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | 0 | 0
Currency risk | Non-Derivative Hedging Instrument | Net investment hedges of foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | (244) | (835)
Currency risk | Hedged Items | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of hedged items | 1,400 | 1,250
Change in fair value of hedged items gain/(loss) | 2 | 32
Currency risk | Hedged Items | Net investment hedges of foreign currency risk |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of hedged items | 0 | 0
Change in fair value of hedged items gain/(loss) | 3 | (108)
Interest rate risk | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedge ineffectiveness (loss)/gain | 0 | 0
Fair value (loss)/gain arising on hedging instruments deferred to OCI | 0 | 0
Fair value amounts reclassified to profit and loss | £ 0 | £ 0
Weighted average interest rate | 4.96% | 0.00%
Weighted average FX rate | 0 | 0
Interest rate risk | Hedging Instruments | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | £ 0 | £ 0
Notional amount of hedged items | £ 0 | £ 0
Notional amount of hedging instruments | 428 | 0
Change in fair value of hedging instrument (loss)/gain | £ 0 | £ 0
Interest rate risk | Non-Derivative Hedging Instrument | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Hedging instrument, liabilities | 0 | 0
Interest rate risk | Hedged Items | Cash Flow Hedges |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |
Notional amount of hedged items | 428 | 0
Change in fair value of hedged items gain/(loss) | £ 0 | £ 0

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- Definition The gain (loss) on the change in fair value of the hedging instrument 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 24A -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_c&doctype=Standard -URIDate 2024-03-27 + Details
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