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Directors' and key management remuneration - Directors (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Directors' and key management remuneration    
Non-executive directors emoluments £ 1,574 £ 1,685
Chairman and executive directors emoluments 6,408 5,804
Short-term compensation expense, directors 7,982 7,489
Amounts receivable under long-term incentive plans and share option plans 2,708 542
Total £ 10,690 £ 8,031