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Finance cost (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Finance cost      
Hedged interest payable on medium-term notes issued £ 39 £ 10 £ 16
Interest payable on bank loans and overdrafts 5 3 3
Interest payable on RCF 1 1 5
Interest payable on foreign exchange swaps 19 14 9
Interest payable on leases 10 6 7
Amortisation of discount on provisions 3    
Fair value loss on hedge ineffectiveness 2   8
Fair value adjustment on debt repayment     4
Fair value loss on other derivatives     26
Total finance cost £ 79 £ 34 £ 78