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Operating expenses - Bonus awards (Details) - GBP (£)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating expenses      
Total Bonus awards £ 301,000,000 £ 206,000,000 £ 307,000,000
Bonus awards as a % of operating profit before tax 7.00% (83.00%)  
Proportion of bonus awards that are deferred 87.00% 83.00%  
Bonus awards      
Operating expenses      
Total Bonus awards £ 301,000,000 £ 206,000,000  
Change % 46.00%    
Non-deferred cash awards      
Operating expenses      
Total Bonus awards £ 38,000,000 35,000,000  
Change % 9.00%    
Total deferred bonus awards      
Operating expenses      
Total Bonus awards £ 263,000,000 171,000,000  
Change % 54.00%    
Deferred cash awards      
Operating expenses      
Total Bonus awards £ 214,000,000 £ 111,000,000  
Change % 93.00%    
Proportion of bonus awards that are deferred 81.00% 65.00%  
Deferred share awards      
Operating expenses      
Total Bonus awards £ 49,000,000 £ 60,000,000  
Change % (18.00%)    
Proportion of bonus awards that are deferred 19.00% 35.00%  
Maximum      
Operating expenses      
Cash awards £ 2,000