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Operating Profit - Operating Expenses (Details) - GBP (£)
£ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Analysis of income and expense [abstract]      
Depreciation and impairment of owned property, plant and equipment £ 3,266 £ 2,470 £ 1,637
Depreciation of assets held under finance leases 72 62 83
Impairment of non-current assets (tangibles and intangibles) 19 0 (80)
Amortisation of intangible assets 2,912 1,814 1,242
Gain on disposal of property, plant and equipment (79) (16) (15)
Loss on disposal of property, plant and equipment 74 122 0
Research and development expenditure credit (1,008) (1,322) (1,117)
Government grants (1,633) (1,691) (1,048)
Share-based compensation 1,505 854 768
Initial public offering preparation costs 4,643 0 0
Operating lease costs, land and buildings £ 8,444 £ 6,443 £ 4,437