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Business combinations (Details)
$ / shares in Units, £ in Millions, customer in Millions, $ in Billions
 12 Months Ended
Oct. 12, 2022
GBP (£)
item
customer
employee
shares
Dec. 31, 2022
GBP (£)
company
Dec. 31, 2021
GBP (£)
company
Dec. 31, 2020
GBP (£)
Oct. 12, 2022
USD ($)
item
customer
employee
$ / shares
shares
Business combinations          
Percentage of share capital acquired   100.00%      
Number of companies and businesses acquired | company   53 52    
Total purchase consideration   £ 4,369 £ 314    
Cash outflow on current and past acquisitions   £ 1,018 463 £ 194  
Percentage of impact on revenue and adjusted operating profit for business combination to be considered material   5.00%      
Percentage of impact on goodwill for business combination to be considered material   10.00%      
Cash transferred   £ 1,301 273    
Goodwill acquired   3,348 231    
Fair value of acquired intangible assets   2,101 71    
Fair value of indefinite lived brands   1,292 0    
Fair value of customer lists   778 70    
Fair value of acquired receivables   359 28    
Revenue from the dates of acquisition   422 50    
Operating profit from the dates of acquisition   3 £ 7    
Terminix Global Holdings, Inc          
Business combinations          
Percentage of share capital acquired 100.00%       100.00%
Total purchase consideration £ 4,110 4,110      
Cash outflow on current and past acquisitions   774      
Number of pest control business combined | item 2       2
Number of combined customers | customer 4.9       4.9
Number of combined employees | employee 58,600       58,600
Cash consideration entitlement for previous owners | $         $ 1.3
Number of shares entitlement for previous owners | item 645,706,920       645,706,920
Number of shares whose holders elected to receive cash consideration | item 38,693,211       38,693,211
Number of shares whose holders elected to receive stock consideration | item 82,919,979       82,919,979
Cash consideration per share held | $ / shares         $ 34.57
Equity interests of acquirer excluding replacement share awards £ 3,007 3,007      
Cash transferred 1,087 1,087      
Replacement employee share awards 16 16      
Loans and borrowings acquired 749        
Goodwill acquired 3,176 3,176      
Fair value of acquired intangible assets 2,027 2,027      
Fair value of indefinite lived brands 1,292        
Fair value of finite lived brands 17        
Fair value of customer lists 708        
Fair value of software 10        
Fair value of acquired receivables 319        
Acquisition related costs recognised as expense 68        
Acquisition related costs recognised in equity £ 16        
Revenue from the dates of acquisition   354      
Operating profit from the dates of acquisition   £ 6      
Terminix Global Holdings, Inc | ADS          
Business combinations          
Number of shares entitlement for previous owners | item 129,141,384       129,141,384
Number of shares issued per share held for cash consideration | shares 0.1447       0.1447
Number of shares issued per share held for stock consideration | shares 1.4899       1.4899