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Goodwill - Summary of Goodwill (Details) - Goodwill - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Changes in goodwill [abstract]    
Beginning balance £ 16,198 £ 11,321
Acquired through business combinations 24,212 4,200
Effect of foreign exchange translations 652 677
Ending balance £ 41,062 £ 16,198