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Operating expenses - Bonus awards (Details) - GBP (£)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating expenses      
Total Bonus awards £ 356,000,000 £ 370,000,000 £ 301,000,000
Bonus awards as a % of operating profit before tax 5.00% 7.00%  
Proportion of bonus awards that are deferred 88.00% 89.00%  
Bonus awards      
Operating expenses      
Total Bonus awards £ 356,000,000 £ 370,000,000  
Change % (4.00%)    
Non-deferred cash awards      
Operating expenses      
Total Bonus awards £ 43,000,000 40,000,000  
Change % 8.00%    
Total deferred bonus awards      
Operating expenses      
Total Bonus awards £ 313,000,000 330,000,000  
Change % (5.00%)    
Deferred cash awards      
Operating expenses      
Total Bonus awards £ 262,000,000 £ 270,000,000  
Change % (3.00%)    
Proportion of bonus awards that are deferred 84.00% 82.00%  
Deferred share awards      
Operating expenses      
Total Bonus awards £ 51,000,000 £ 60,000,000  
Change % (15.00%)    
Proportion of bonus awards that are deferred 16.00% 18.00%  
Maximum      
Operating expenses      
Cash awards £ 2,000