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Deferred tax - Analysis of the deferred tax (Details) - GBP (£) £ in Thousands | Dec. 31, 2018 | Jun. 30, 2018 | [1] | Dec. 31, 2017 | [1] | Jun. 30, 2017 | [1]
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Analysis of deferred tax |  |  |  |
Deferred tax assets | £ (57,636) | £ (63,332) | £ (77,500) | £ (141,485)
Deferred tax liabilities | 33,302 | 29,134 | 35,801 | 21,536
Net deferred tax asset | (24,334) | (34,198) | (41,699) | £ (119,949)
US |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax assets | (57,636) | (63,332) | (77,500) |
UK |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax liabilities | £ 33,302 | £ 29,134 | £ 35,801 |
[1] | Comparative amounts have been restated - see note 34 to the interim consolidated financial statements for further details.

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax assets net of deferred tax liabilities, when the absolute amount of deferred tax assets is greater than the absolute amount of deferred tax liabilities. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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