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Leases - Other lease costs (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Leases    
Expenses relating to short-term leases £ 14 £ 13
Expenses relating to leases of low-value assets 8 8
Expenses relating to variable lease payments 2  
At 31 December £ 24 £ 21