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Financial risk management - Summary of hedging reserve (Details) - GBP (£)
£ in Thousands
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Financial risk management      
Cash flow hedge reserve £ 1,521 £ 2,815 £ 2,249
Cost of hedging reserve (1,546) 1,187  
Total hedging reserve £ (25) £ 4,002 £ 2,249