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Trade and other receivables - Carrying amounts of trade receivables denominated in different currencies (Details) - GBP (£)
£ in Millions
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents    
Trade receivables £ 622 £ 424
Gross    
Cash and cash equivalents    
Trade receivables 692 474
Pound sterling | Gross    
Cash and cash equivalents    
Trade receivables 48 52
Euro | Gross    
Cash and cash equivalents    
Trade receivables 159 150
US dollar | Gross    
Cash and cash equivalents    
Trade receivables 301 133
Other currencies | Gross    
Cash and cash equivalents    
Trade receivables £ 184 £ 139