v3.25.4
Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of detailed information about property, plant and equipment      
At start of year £ 82    
Charge for the year (26) £ (34) £ (43)
At end of year 72 82  
Cost      
Disclosure of detailed information about property, plant and equipment      
At start of year 398 507  
Capital expenditure 21 20  
Disposals (59) (129)  
Exchange translation differences (18)    
At end of year 342 398 507
Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment      
At start of year (316) (408)  
Charge for the year (26) (34)  
Disposals 59 126  
Exchange translation differences 13    
At end of year (270) (316) (408)
Land and buildings      
Disclosure of detailed information about property, plant and equipment      
At start of year 36    
At end of year 33 36  
Land and buildings | Cost      
Disclosure of detailed information about property, plant and equipment      
At start of year 110 134  
Capital expenditure 1 1  
Disposals (9) (25)  
Exchange translation differences (5)    
At end of year 97 110 134
Land and buildings | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment      
At start of year (74) (92)  
Charge for the year (4) (5)  
Disposals 10 23  
Exchange translation differences 4    
At end of year (64) (74) (92)
Fixtures and equipment      
Disclosure of detailed information about property, plant and equipment      
At start of year 46    
At end of year 39 46  
Fixtures and equipment | Cost      
Disclosure of detailed information about property, plant and equipment      
At start of year 288 373  
Capital expenditure 20 19  
Disposals (50) (104)  
Exchange translation differences (13)    
At end of year 245 288 373
Fixtures and equipment | Accumulated depreciation      
Disclosure of detailed information about property, plant and equipment      
At start of year (242) (316)  
Charge for the year (22) (29)  
Disposals 49 103  
Exchange translation differences 9    
At end of year £ (206) £ (242) £ (316)