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Earnings per share (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Earnings Per Share
       
All figures in £ millions   
2022
     2021
1
    2020
1
 
       
Earnings for the year   
 
244
 
     178       330   
       
Non-controlling
interest		   
 
(2
) 
     (1 )      –  
       
Earnings attributable to equity shareholders
   
 
242
 
     177       330  
       
Weighted average number of shares (millions)   
 
        738.1
 
             754.1               755.4  
       
Effect of dilutive share options (millions)   
 
3.9
 
     5.0       –  
       
Weighted average number of shares (millions) for diluted earnings   
 
742.0
 
     759.1       755.4  
       
Earnings per share (in pence per share)
                         
       
Basic   
 
32.8p
 
     23.5p       43.7p  
       
Diluted   
 
32.6p
 
     23.3p       43.7p  
 
1.
  Comparative balances have been restated – see Note 1b.