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Net debt - Offsetting in the balance sheet (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Financial assets    
Gross amount £ 1,822 £ 2,490
Net amounts presented in the balance sheet 1,822 2,490
Amount subject to master netting arrangement (554) (756)
Net amount 1,268 1,734
Financial liabilities    
Gross amount (4,988) (5,646)
Net amounts presented in the balance sheet (4,988) (5,646)
Amount subject to master netting arrangement 554 756
Net amount (4,434) (4,890)
Trade and other payables    
Financial liabilities    
Gross amount (847) (866)
Net amounts presented in the balance sheet (847) (866)
Net amount (847) (866)
Borrowings    
Financial liabilities    
Gross amount (3,664) (4,287)
Net amounts presented in the balance sheet (3,664) (4,287)
Amount subject to master netting arrangement 553 730
Net amount (3,111) (3,557)
Lease liabilities    
Financial liabilities    
Gross amount (445) (445)
Net amounts presented in the balance sheet (445) (445)
Net amount (445) (445)
Derivative financial instruments    
Financial liabilities    
Gross amount (32) (48)
Net amounts presented in the balance sheet (32) (48)
Amount subject to master netting arrangement 1 26
Net amount (31) (22)
Cash and cash equivalents    
Financial assets    
Gross amount 925 1,562
Net amounts presented in the balance sheet 925 1,562
Amount subject to master netting arrangement (553) (730)
Net amount 372 832
Trade and other receivables    
Financial assets    
Gross amount 889 857
Net amounts presented in the balance sheet 889 857
Net amount 889 857
Other financial assets    
Financial assets    
Gross amount 2 1
Net amounts presented in the balance sheet 2 1
Net amount 2 1
Derivative financial instruments    
Financial assets    
Gross amount 6 70
Net amounts presented in the balance sheet 6 70
Amount subject to master netting arrangement (1) (26)
Net amount £ 5 £ 44