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Leases - Right of use assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Leases    
Net book value at beginning of the year £ 228 £ 218
Exchange differences 3 (3)
Additions 138 91
Disposals   (2)
Acquisition of companies and businesses 199 8
Impairment charge (17)  
Depreciation charge (89) (78)
Reclassification to property, plant and equipment (8) (6)
Net book value at end of the year 454 228
Acquisitions 200 2
Impaired right-of-use assets    
Leases    
Recoverable amount £ 25  
Discount rate 6.00%  
Land and buildings    
Leases    
Net book value at beginning of the year £ 94 96
Exchange differences   (2)
Additions 69 33
Disposals   (1)
Acquisition of companies and businesses 79 5
Impairment charge (17)  
Depreciation charge (43) (37)
Net book value at end of the year 182 94
Vehicles    
Leases    
Net book value at beginning of the year 132 120
Exchange differences 3 (1)
Additions 69 56
Disposals   (1)
Acquisition of companies and businesses 120 3
Depreciation charge (45) (39)
Reclassification to property, plant and equipment (8) (6)
Net book value at end of the year 271 132
Other equipment    
Leases    
Net book value at beginning of the year 2 2
Additions   2
Depreciation charge (1) (2)
Net book value at end of the year £ 1 £ 2