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Net debt - Reconciliation (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Net debt    
Opening £ (3,146) £ (3,279)
Cash flows 203 284
Non-cash (fair value changes, accruals and acquisitions) (252) (269)
Non-cash (foreign exchange, additions and other) (13) 118
Closing (3,208) (3,146)
Bank and other short-term borrowings    
Net debt    
Opening (1,134) (1,345)
Cash flows 602 664
Non-cash (fair value changes, accruals and acquisitions) (99) (106)
Non-cash (foreign exchange, additions and other) (535) (347)
Closing (1,166) (1,134)
Bank and other long-term borrowings    
Net debt    
Opening (3,153) (3,574)
Non-cash (foreign exchange, additions and other) 655 421
Closing (2,498) (3,153)
Lease liabilities    
Net debt    
Opening (445) (460)
Cash flows 169 182
Non-cash (fair value changes, accruals and acquisitions) (146) (162)
Non-cash (foreign exchange, additions and other) (23) (5)
Closing (445) (445)
Other investments    
Net debt    
Opening 1 1
Cash flows 1  
Closing 2 1
Fair value of debt-related derivatives    
Net debt    
Opening 23 (71)
Cash flows 68 39
Non-cash (fair value changes, accruals and acquisitions) (7) (1)
Non-cash (foreign exchange, additions and other) (110) 56
Closing (26) 23
Gross debt    
Net debt    
Opening (4,708) (5,449)
Cash flows 840 885
Non-cash (fair value changes, accruals and acquisitions) (252) (269)
Non-cash (foreign exchange, additions and other) (13) 125
Closing (4,133) (4,708)
Cash and cash equivalents in the Consolidated Balance Sheet    
Net debt    
Opening 1,562 2,170
Cash flows (637) (601)
Non-cash (foreign exchange, additions and other)   (7)
Closing £ 925 £ 1,562