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Business combinations - Cash Outflow From Current and Past acquisitions (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Oct. 12, 2022
Business combinations        
Total purchase consideration £ 4,369 £ 314    
Equity interests of acquirer (3,023)      
Consideration payable in future periods (45) (41)    
Purchase consideration paid in cash 1,301 273    
Cash and cash equivalents in acquired companies and businesses (322) (6)    
Cash outflow on current period acquisitions 979 267    
Deferred consideration paid 39 196    
Cash outflow on current and past acquisitions 1,018 £ 463 £ 194  
Terminix Global Holdings, Inc        
Business combinations        
Total purchase consideration 4,110     £ 4,110
Equity interests of acquirer (3,023)      
Purchase consideration paid in cash 1,087     £ 1,087
Cash and cash equivalents in acquired companies and businesses (313)      
Cash outflow on current period acquisitions 774      
Cash outflow on current and past acquisitions 774      
Individually immaterial acquisitions        
Business combinations        
Total purchase consideration 259      
Consideration payable in future periods (45)      
Purchase consideration paid in cash 214      
Cash and cash equivalents in acquired companies and businesses (9)      
Cash outflow on current period acquisitions 205      
Deferred consideration paid 39      
Cash outflow on current and past acquisitions £ 244