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Commitments - Capital commitments (Details) - GBP (£)
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Property, plant and equipment      
Capital commitments      
Capital commitments £ 2,090,000 £ 1,185,000 £ 1,437,000
Other intangible assets      
Capital commitments      
Capital commitments £ 192,000 £ 1,476,000 £ 472,000