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Deferred Tax Assets and Liabilities - Summary of Deferred Taxes (Details) - GBP (£) £ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	£ (1,719)	£ (424)
Exchange adjustments	(65)	(124)
Credit (charge) to profit and loss	350	(138)
Credit to equity	1,090	42
Acquisition	0	(1,075)
Ending balance	(344)	(1,719)
Deferred tax charge related to changes in tax rates	60	0
Accelerated capital allowances
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	(76)	(34)
Exchange adjustments	(2)	0
Credit (charge) to profit and loss	(9)	(42)
Credit to equity	0	0
Acquisition	0	0
Ending balance	(87)	(76)
Tax losses
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	227	312
Exchange adjustments	0	15
Credit (charge) to profit and loss	(165)	(100)
Credit to equity	0	0
Acquisition	0	0
Ending balance	62	227
Share-based compensation
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	271	117
Exchange adjustments	0	(1)
Credit (charge) to profit and loss	309	113
Credit to equity	1,090	42
Acquisition	0	0
Ending balance	1,670	271
Intangible assets
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	(2,490)	(1,543)
Exchange adjustments	(61)	(141)
Credit (charge) to profit and loss	462	269
Credit to equity	0	0
Acquisition	0	(1,075)
Ending balance	(2,089)	(2,490)
Other temporary differences
Reconciliation of changes in deferred tax liability (asset) [abstract]
Beginning balance	349	724
Exchange adjustments	(2)	3
Credit (charge) to profit and loss	(247)	(378)
Credit to equity	0	0
Acquisition	0	0
Ending balance	£ 100	£ 349

X

- Definition

The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2017-01-01
-Paragraph 81
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- Definition

The amount of deferred tax expense or income relating to tax rate changes or the imposition of new taxes. [Refer: Deferred tax expense (income)]

+ References

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-Name IAS
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The amount of deferred tax related to items credited (charged) directly to equity. [Refer: Deferred tax expense (income)]

+ References

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-Name IAS
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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

+ References

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- Definition

The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)]

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