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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