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Revenue recognition and operating segments (Details)
£ in Millions
 12 Months Ended
Dec. 31, 2023
GBP (£)
item
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Disclosure of disaggregation of revenue from contracts with customers      
Contract costs £ 224 [1] £ 215 [1] £ 75
Amortisation of contract costs 121 39 30
Impairment losses on contract costs £ 0 £ 0 £ 0
Number of secondary reportable business segments | item 3    
Minimum      
Disclosure of disaggregation of revenue from contracts with customers      
Amortization period of contract costs 3 years    
Maximum      
Disclosure of disaggregation of revenue from contracts with customers      
Amortization period of contract costs 7 years    
Termite contracts      
Disclosure of disaggregation of revenue from contracts with customers      
Period of assurance warranties 12 months    
Job work | Maximum      
Disclosure of disaggregation of revenue from contracts with customers      
Period of service 1 month    
Job work | Hygiene & Wellbeing | Performance obligations satisfied at point in time | Maximum      
Disclosure of disaggregation of revenue from contracts with customers      
Period of service 7 days    
[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).