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Trade and other receivables - Carrying amounts of trade receivables denominated in different currencies (Details) - GBP (£)
£ in Millions
Dec. 31, 2024
Dec. 31, 2023
Cash and cash equivalents    
Trade receivables £ 640 £ 622
Gross    
Cash and cash equivalents    
Trade receivables 705 692
Pound sterling | Gross    
Cash and cash equivalents    
Trade receivables 57 51
Euro | Gross    
Cash and cash equivalents    
Trade receivables 160 161
US dollar | Gross    
Cash and cash equivalents    
Trade receivables 302 291
Other currencies | Gross    
Cash and cash equivalents    
Trade receivables £ 186 £ 189