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Fair value estimation - Maturity of financial instruments (Details) - GBP (£) £ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Fair value estimation |  |
Borrowings | £ (4,051) | £ (4,812)
Non-derivative financial instruments | (4,051) | (4,812)
Net derivative inflow/(outflow) | (97) | (49)
Net inflow/(outflow) | (4,148) | (4,861)
Less than 1 year |  |
Fair value estimation |  |
Borrowings | (1,225) | (1,209)
Non-derivative financial instruments | (1,225) | (1,209)
Net derivative inflow/(outflow) | (25) | (44)
Net inflow/(outflow) | (1,250) | (1,253)
Between 1 and 5 years |  |
Fair value estimation |  |
Borrowings | (1,848) | (2,601)
Non-derivative financial instruments | (1,848) | (2,601)
Net derivative inflow/(outflow) | (72) | (4)
Net inflow/(outflow) | (1,920) | (2,605)
Over 5 years |  |
Fair value estimation |  |
Borrowings | (978) | (1,003)
Non-derivative financial instruments | (978) | (1,003)
Net inflow/(outflow) | (978) | (1,003)
Cross-currency interest rate swaps |  |
Fair value estimation |  |
Outflow | (1,742) | (2,162)
Inflow | 1,648 | 2,103
Cross-currency interest rate swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow | (47) | (454)
Inflow | 25 | 400
Cross-currency interest rate swaps | Between 1 and 5 years |  |
Fair value estimation |  |
Outflow | (1,695) | (1,707)
Inflow | 1,623 | 1,703
Interest rate swaps |  |
Fair value estimation |  |
Outflow |  | (21)
Inflow |  | 31
Interest rate swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow |  | (21)
Inflow |  | 31
Foreign exchange swaps |  |
Fair value estimation |  |
Outflow | (363) | (140)
Inflow | 360 | 140
Foreign exchange swaps | Less than 1 year |  |
Fair value estimation |  |
Outflow | (363) | (140)
Inflow | 360 | £ 140
Foreign exchange forwards |  |
Fair value estimation |  |
Outflow | (11) |
Inflow | 11 |
Foreign exchange forwards | Less than 1 year |  |
Fair value estimation |  |
Outflow | (11) |
Inflow | £ 11 |

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