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Provisions for liabilities and charges - Summary of Provisions for Liabilities and Charges (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of Noncurrent Provisions [line items]    
Beginning balance £ 305 £ 245
Charged to the income statement 129 90
Acquisitions   1
Utilised (50) (41)
Released to the income statement (30) (14)
Other movements 18 36
Exchange adjustments 3 (12)
Ending balance 375 305
Employee benefits    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 153 143
Charged to the income statement 14 3
Acquisitions   0
Utilised (33) (22)
Released to the income statement 0 (2)
Other movements 28 38
Exchange adjustments 2 (7)
Ending balance 164 153
Property    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 99 63
Charged to the income statement 12 64
Acquisitions   0
Utilised (17) (18)
Released to the income statement (12) (4)
Other movements (10) (3)
Exchange adjustments (1) (3)
Ending balance 71 99
Legal    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 35 13
Charged to the income statement 102 23
Acquisitions   0
Utilised 0 0
Released to the income statement (6) (2)
Other movements 0 1
Exchange adjustments 1 0
Ending balance 132 35
Other    
Disclosure of Noncurrent Provisions [line items]    
Beginning balance 18 26
Charged to the income statement 1 0
Acquisitions   1
Utilised 0 (1)
Released to the income statement (12) (6)
Other movements 0 0
Exchange adjustments 1 (2)
Ending balance £ 8 £ 18