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Deferred income tax - Major components of deferred tax assets and liabilities at the year end and their changes (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred income tax      
At 1 January £ 66 £ 57  
Exchange differences (27) (2)  
Recognised in income statement (14) 8 £ (23)
Recognised in other comprehensive income (5)    
Recognised in equity 2 (5)  
Acquired in business combinations 446 8  
At 31 December 468 66 57
Customer lists / intangibles      
Deferred income tax      
At 1 January 84 76  
Exchange differences (32)    
Recognised in income statement (1) 1  
Acquired in business combinations 519 7  
At 31 December 570 84 76
Accelerated tax depreciation      
Deferred income tax      
At 1 January 50 44  
Exchange differences   (1)  
Recognised in income statement (4) 7  
Acquired in business combinations 29    
At 31 December 75 50 44
Provisions      
Deferred income tax      
At 1 January (52) (45)  
Exchange differences 8 (1)  
Recognised in income statement (4) (7)  
Acquired in business combinations (123) 1  
At 31 December (171) (52) (45)
IFRS 15 Contracts      
Deferred income tax      
At 1 January 9 8  
Exchange differences (2)    
Recognised in income statement 2 1  
Acquired in business combinations 24    
At 31 December 33 9 8
Tax losses      
Deferred income tax      
At 1 January (14) (18)  
Recognised in income statement (2) 4  
Recognised in other comprehensive income (4)    
Acquired in business combinations (3)    
At 31 December (23) (14) (18)
Share-based payments      
Deferred income tax      
At 1 January (15) (9)  
Recognised in income statement (3) (1)  
Recognised in equity 2 (5)  
At 31 December (16) (15) (9)
Other      
Deferred income tax      
At 1 January 4 1  
Exchange differences (1)    
Recognised in income statement (2) 3  
Recognised in other comprehensive income £ (1)    
At 31 December   £ 4 £ 1