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Commitments - Capital commitments (Details) - GBP (£)
Dec. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Property, plant and equipment      
Capital commitments      
Capital commitments £ 1,437,000 £ 1,240,000 £ 242,000
Other intangible assets      
Capital commitments      
Capital commitments £ 472,000 £ 479,000 £ 452,000