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Trade and other receivables - Carrying amounts of trade receivables denominated in different currencies (Details) - GBP (£)
£ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cash and cash equivalents    
Trade receivables £ 622 £ 622
Gross    
Cash and cash equivalents    
Trade receivables 692 692
Pound sterling | Gross    
Cash and cash equivalents    
Trade receivables 51 48
Euro | Gross    
Cash and cash equivalents    
Trade receivables 161 159
US dollar | Gross    
Cash and cash equivalents    
Trade receivables 291 301
Other currencies | Gross    
Cash and cash equivalents    
Trade receivables £ 189 £ 184