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Investments in associated undertakings (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Oct. 12, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments in associated undertakings            
Balance at beginning [1]       £ 63    
Share of profit from associates (net of tax)       9 £ 9 £ 8
Dividends received       (4) (4) (4)
Balance at end [1] £ 44 £ 63   44 63  
Revenue       5,375 3,714 2,957
Profit       381 232 263
Measurement period adjustments            
Investments in associated undertakings            
Balance at beginning       10    
Balance at end   10 £ 11   10  
Nippon Calmic Limited            
Investments in associated undertakings            
Balance at beginning       32 29  
Exchange differences       (4) (1)  
Share of profit from associates (net of tax)       7 8  
Dividends received       (4) (4)  
Balance at end £ 31 £ 32   31 32 29
Tax expense on share of profit       4 4  
Ownership interest in associate 49.00% 49.00%        
Assets £ 60 £ 66   60 66  
Liabilities (28) (33)   (28) (33)  
Revenue       54 52  
Profit       7 8  
Individually immaterial associated undertakings            
Investments in associated undertakings            
Balance at beginning       31 1  
Exchange differences       (1) (2)  
Acquisitions         31  
Disposals       (19)    
Share of profit from associates (net of tax)       2 1  
Balance at end £ 13 £ 31   13 31 £ 1
Unrecognised share of losses of associates       £ 0 £ 1  
[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).