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Related party transactions and Directors' remuneration - Disclosure required by the Companies Act 2006 (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Aggregate emoluments £ 9.8 £ 9.3 £ 8.2
Amounts paid under LTIPs 0.0 0.4 1.2
Total directors expense in accordance with companies act 2006 9.8 9.7 9.4
Director | Deferred Share Value Plan and Share Value Plan      
Disclosure of transactions between related parties [line items]      
Aggregate emoluments £ 1.5 £ 2.3 £ 1.4