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Commitments - Capital commitments (Details) - GBP (£)
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Property, plant and equipment      
Capital commitments      
Capital commitments £ 1,970,000 £ 4,054,000 £ 1,753,000
Other intangible assets      
Capital commitments      
Capital commitments £ 0 £ 0 £ 0