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Deferred tax - Analysis of the deferred tax (Details) - GBP (£) £ in Thousands | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018
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Analysis of deferred tax |  |  |  |
Deferred tax assets | £ (53,862) | £ (58,415) | £ (57,636) |
Deferred tax liabilities | 37,766 | 31,865 | 33,302 |
Net deferred tax asset | (16,096) | (26,550) | (24,334) | £ (34,198)
US |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax assets | (53,862) | (58,415) | (57,636) |
UK |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax liabilities | £ 37,766 | £ 31,865 | £ 33,302 |

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 + Details
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