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Leases - Other lease costs (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Leases    
Expenses relating to short-term leases £ 13 £ 12
Expenses relating to leases of low-value assets 8 6
Expenses relating to variable lease payments   1
At 31 December £ 21 £ 19