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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
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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

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- Definition The fair value of financial assets. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard -URIDate 2018-03-16 + Details
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