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Provisions for liabilities and charges (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Oct. 12, 2022
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 514 £ 61  
Exchange differences (22) (36)  
Additional provisions 81 41  
Used during the year (126) (46)  
Unused amounts reversed (11) (8)  
Acquisition of companies and businesses 1 498  
Unwinding of discount on provisions 14 4  
Ending balance 451 514  
Analysed as follows:      
Non-current [1] 357 381  
Current 94 133  
Total £ 451 £ 514  
Measurement period adjustments      
Analysed as follows:      
Non-current     £ 24
UNITED STATES | Minimum      
Provisions for liabilities and charges      
Discount rate used in cash flow projections 3.88% 3.50%  
UNITED STATES | Maximum      
Provisions for liabilities and charges      
Discount rate used in cash flow projections 5.25% 5.875%  
Termite damage claims      
Provisions for liabilities and charges      
Utilisation period of provisions 20 years    
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 321    
Exchange differences (14) £ (29)  
Additional provisions 15 3  
Used during the year (73) (10)  
Acquisition of companies and businesses   354  
Unwinding of discount on provisions 11 3  
Ending balance 260 321  
Analysed as follows:      
Total 260 321  
Termite damage claims | Measurement period adjustments      
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 18    
Ending balance   18  
Analysed as follows:      
Total   18  
Termite damage claims | Discount 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 £ (3) £ (3)  
Percentage of actual increase (decrease) in risk assumption (4.00%)    
Discount rate used in cash flow projections 3.88% 4.03%  
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 £ 15 £ 14  
Percentage of actual increase (decrease) in risk assumption 32.00% 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 £ 15 £ 14  
Percentage of actual increase (decrease) in risk assumption (7.00%) (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 £ 11 £ 10  
Percentage of actual increase (decrease) in risk assumption 1.80% 1.20%  
Termite damage claims | Minimum | Claim cost      
Provisions for liabilities and charges      
Historical time period for each material category of claim 3 months    
Termite damage claims | Maximum | Claim cost      
Provisions for liabilities and charges      
Historical time period for each material category of claim 1 year    
Self-insurance      
Provisions for liabilities and charges      
Utilisation period of provisions 5 years    
Reimbursement from third party insurers £ 21    
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance 165 £ 37  
Exchange differences (8) (7)  
Additional provisions 56 30  
Used during the year (44) (26)  
Unused amounts reversed (8) (6)  
Acquisition of companies and businesses   136  
Unwinding of discount on provisions 3 1  
Ending balance 164 165  
Analysed as follows:      
Total £ 164 165  
Environmental      
Provisions for liabilities and charges      
Utilisation period of provisions 5 years    
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 16 11  
Exchange differences (1)    
Additional provisions 3    
Used during the year (2) (2)  
Acquisition of companies and businesses   7  
Ending balance 16 16  
Analysed as follows:      
Total 16 16  
Environmental | Measurement period adjustments      
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 4    
Ending balance   4  
Analysed as follows:      
Total   4  
Other      
Provisions for liabilities and charges      
Utilisation period of provisions 5 years    
Reconciliation of changes in provisions for liabilities and charges      
Beginning balance £ 12 13  
Exchange differences 1    
Additional provisions 7 8  
Used during the year (7) (8)  
Unused amounts reversed (3) (2)  
Acquisition of companies and businesses 1 1  
Ending balance 11 12  
Analysed as follows:      
Total £ 11 £ 12  
[1] Goodwill, right-of-use assets, investments in associated undertakings, contract costs, accrued income, accruals, loans, long-term liabilities, lease liabilities, deferred tax liabilities, and provisions have been retrospectively adjusted in 2022, in accordance with IFRS 3, to reflect measurement period adjustments made relating to the Terminix acquisition (see Note B1).