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Operating expenses - Bonus awards (Details) - GBP (£)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating expenses      
Total Bonus awards £ 448,000,000 £ 356,000,000 £ 370,000,000
Bonus awards as a % of operating profit before tax and bonus awards 7.00% 5.00%  
March cash award per employee £ 2,000    
Bonus awards      
Operating expenses      
Total Bonus awards £ 448,000,000 £ 356,000,000  
Change % 26.00%    
March awards      
Operating expenses      
Total Bonus awards £ 63,000,000 43,000,000  
Change % 47.00%    
Total deferred bonus awards      
Operating expenses      
Total Bonus awards £ 385,000,000 313,000,000  
Change % 23.00%    
Deferred cash awards      
Operating expenses      
Total Bonus awards £ 324,000,000 £ 262,000,000  
Change % 24.00%    
Proportion of bonus awards that are deferred 86.00% 86.00%  
Deferred share awards      
Operating expenses      
Total Bonus awards £ 61,000,000 £ 51,000,000  
Change % 20.00%    
Proportion of bonus awards that are deferred 14.00% 14.00%