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Commitments - Capital commitments (Details) - GBP (£)
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Property, plant and equipment      
Capital commitments      
Capital commitments £ 242,000 £ 972,000 £ 4,523,000
Other intangible assets      
Capital commitments      
Capital commitments £ 452,000 £ 405,000 £ 280,000