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Leases - Movement in lease liabilities (Details) - GBP (£)
£ in Thousands
6 Months Ended
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Leases      
Beginning balance £ 8,641 £ 8,565 £ 8,880
Cash flows (311) (863) (806)
Additions 81 606 143
Accretion expense 279 333 348
Ending balance £ 8,690 £ 8,641 £ 8,565