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Cash and cash equivalents (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents.        
Restricted cash £ 16 £ 15    
Cash held in countries with foreign exchange regulations 71 70    
Cash at bank and in hand 796 1,080    
Money market funds 24 153    
Short-term bank deposits 105 329    
Cash and cash equivalents in the Consolidated Balance Sheet 925 1,562    
Bank overdraft (553) (730)    
Cash and cash equivalents in the Consolidated Cash Flow Statement £ 372 £ 832 £ 879 £ 242