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Financial risk management - Movements on provision for impairment (Details) - Trade receivables - GBP (£)
£ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Movements on the provision for impairment of trade receivables    
Brought forward £ 14,113 £ 6,451
Provision for receivables impairment 160 336
Receivables provided subsequently written off (6,943)  
Receivables offset against deferred revenue 2,591 6,807
Foreign exchange (gains)/losses on retranslation (213) 519
Carried forward £ 9,708 £ 14,113