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Other assets (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Other assets    
Interests in associates £ 690 £ 668
Property, plant and equipment 3,967 4,227
Pension schemes in net surplus 190 201
Tax recoverable 7 49
Deferred tax 1,876 1,894
Assets of disposal groups 64 902
Other 1,602 1,721
Other assets £ 8,396 9,662
Freehold buildings and long leaseholds    
Other assets    
Useful life measured as period of time, property, plant and equipment 50 years  
Short leaseholds for unexpired period of lease and property adaption costs | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 15 years  
Short leaseholds for unexpired period of lease and property adaption costs | Minimum    
Other assets    
Useful life measured as period of time, property, plant and equipment 10 years  
Computers equipment | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 5 years  
Other equipment | Maximum    
Other assets    
Useful life measured as period of time, property, plant and equipment 15 years  
Other equipment | Minimum    
Other assets    
Useful life measured as period of time, property, plant and equipment 4 years  
Business Growth Fund    
Other assets    
Interests in associates £ 678 £ 658