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Intangible assets - product development (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Intangible Assets Product Development
     
All figures in £ millions
   
2022
    
2021
  
     
Cost
                 
     
At 1 January
   
 
2,698
 
  
 
2,514
 
     
Exchange differences
   
 
235
 
  
 
–
 
     
Additions
   
 
357
 
  
 
287
 
     
Disposals and retirements
   
 
(191
) 
  
 
(92
) 
     
Disposal of subsidiary (note 31)
   
 
(186
) 
  
 
(9
) 
     
Transfers
   
 
5
 
  
 
(2
) 
     
At 31 December
   
 
        2,918
 
  
 
        2,698
 
     
Amortisation
                 
     
At 1 January
   
 
(1,804
) 
  
 
(1,609
) 
     
Exchange differences
   
 
(174
) 
  
 
(3
) 
     
Charge for the year
   
 
(288
) 
  
 
(260
) 
     
Impairment
   
 
(15
) 
  
 
(19
) 
     
Disposals and retirements
   
 
191
 
  
 
92
 
     
Disposal of subsidiary (note 31)
   
 
147
 
  
 
3
 
     
Transfers
   
 
–
 
  
 
(8
) 
     
At 31 December
   
 
(1,943
) 
  
 
(1,804
) 
     
Carrying amounts at 31 December
   
 
975
 
  
 
894