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Provisions for liabilities and charges (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of changes in provisions for liabilities and charges    
Beginning balance £ 61 £ 64
Exchange differences (35) (1)
Additional provisions 41 24
Used during the year (46) (25)
Unused amounts reversed (8) (3)
Acquisition of companies and businesses 475 2
Unwinding of discount on provisions 4  
Ending balance 492 61
Analysed as follows:    
Non-current 359 34
Current 133 27
Total £ 492 £ 61
UNITED STATES    
Provisions for liabilities and charges    
Discount rate used in cash flow projections   0.90%
UNITED STATES | Minimum    
Provisions for liabilities and charges    
Discount rate used in cash flow projections 3.50%  
UNITED STATES | Maximum    
Provisions for liabilities and charges    
Discount rate used in cash flow projections 5.875%  
Termite damage claims    
Reconciliation of changes in provisions for liabilities and charges    
Exchange differences £ (28)  
Additional provisions 3  
Used during the year (10)  
Acquisition of companies and businesses 335  
Unwinding of discount on provisions 3  
Ending balance 303  
Analysed as follows:    
Total £ 303  
Utilisation period of provisions 20 years  
Termite damage claims | Discount rate    
Provisions for liabilities and charges    
Discount rate used in cash flow projections 4.31% 0.90%
Discount rate after potential increase used in cash flow projections 4.53%  
Percentage of reasonably possible increase in risk assumption 5.00%  
Increase (decrease) in provision due to increase in assumption £ (3)  
Termite damage claims | Claim cost    
Provisions for liabilities and charges    
Percentage of reasonably possible increase in risk assumption 5.00%  
Increase (decrease) in provision due to increase in assumption £ 14  
Percentage of actual increase (decrease) in risk assumption 17.00%  
Termite damage claims | Claim rate    
Provisions for liabilities and charges    
Percentage of reasonably possible increase in risk assumption 5.00%  
Increase (decrease) in provision due to increase in assumption £ 14  
Percentage of actual increase (decrease) in risk assumption (16.00%)  
Termite damage claims | Customer churn rate    
Provisions for liabilities and charges    
Percentage of reasonably possible increase in risk assumption 1.00%  
Increase (decrease) in provision due to increase in assumption £ 10  
Percentage of actual increase (decrease) in risk assumption 1.20%  
Termite damage claims | Minimum | Claim cost    
Provisions for liabilities and charges    
Historical time period for each material category of claim 6 months  
Termite damage claims | Maximum | Claim cost    
Provisions for liabilities and charges    
Historical time period for each material category of claim 5 years  
Self-insurance    
Reconciliation of changes in provisions for liabilities and charges    
Beginning balance £ 37 £ 32
Exchange differences (7)  
Additional provisions 30 18
Used during the year (26) (14)
Unused amounts reversed (6) (1)
Acquisition of companies and businesses 136 2
Unwinding of discount on provisions 1  
Ending balance 165 37
Analysed as follows:    
Total £ 165 37
Estimated minimum percentage of insurance claims that should settle within the next five years 50.00%  
Estimated maximum percentage of insurance claims that should settle within the next five years 75.00%  
Environmental    
Reconciliation of changes in provisions for liabilities and charges    
Beginning balance £ 11 14
Exchange differences   (1)
Used during the year (2) (2)
Acquisition of companies and businesses 3  
Ending balance 12 11
Analysed as follows:    
Total £ 12 11
Utilisation period of provisions 5 years  
Other    
Reconciliation of changes in provisions for liabilities and charges    
Beginning balance £ 13 18
Additional provisions 8 6
Used during the year (8) (9)
Unused amounts reversed (2) (2)
Acquisition of companies and businesses 1  
Ending balance 12 13
Analysed as follows:    
Total £ 12 £ 13
Utilisation period of provisions 5 years