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Sources of estimation uncertainty and significant accounting judgements (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2017
Sources of estimation uncertainty and significant accounting judgements        
Intangible assets £ 7,319 £ 2,164 £ 1,922  
Percentage of share capital acquired 100.00%      
Put option liability £ 45 £ 42    
PCI India        
Sources of estimation uncertainty and significant accounting judgements        
Percentage of share capital acquired       57.00%
Percentage of share capital not acquired       43.00%
Put option liability 45      
Indefinite lived brands | Terminix CGU        
Sources of estimation uncertainty and significant accounting judgements        
Intangible assets £ 1,292      
Useful life, if assets had finite useful life 15 years      
Amortisation charge, if assets had finite useful life £ 86