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Cash and cash equivalents (excluding overdrafts) (Tables)
 12 Months Ended
Dec. 31, 2023
Statement [line items]  
Summary of Cash and Cash Equivalents
All figures in £ millions   
 
    2023  
         2022  
Cash at bank and in hand
   
 
312  
 
      269  
Short-term bank deposits
   
 
–  
 
      289  
Cash and cash equivalents
   
 
312 
 
      558  
 
All figures in £ millions   
 
     2023 
         2022  
Cash and cash equivalents
   
 
312 
 
      558  
Bank overdrafts
   
 
(3)
 
      (15 ) 
Cash and cash equivalents in the cash flow statement
   
 
309 
 
      543