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Commitments - Capital commitments (Details) - GBP (£)
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Property, plant and equipment      
Capital commitments      
Capital commitments £ 4,523,000 £ 3,794,000 £ 1,970,000
Other intangible assets      
Capital commitments      
Capital commitments £ 280,000 £ 0 £ 0