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Financial risk management - Fair value estimation (Details) - Level 2 - Carried at fair value - GBP (£)
£ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Capital risk management and fair value estimation      
Financial assets, at fair value £ 3,184 £ 5,966 £ 3,896
Embedded foreign exchange derivatives | At fair value through profit and loss      
Capital risk management and fair value estimation      
Financial assets, at fair value 680 624 869
Forward foreign currency contracts | At fair value through profit and loss      
Capital risk management and fair value estimation      
Financial assets, at fair value   852 2,120
Interest rate swap | Derivatives used for hedging:      
Capital risk management and fair value estimation      
Financial assets, at fair value £ 2,504 £ 4,490 £ 907