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Deferred tax - Analysis of the deferred tax (Details) - GBP (£) £ in Thousands | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
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Analysis of deferred tax |  |  |  |
Deferred tax assets | £ (61,786) | £ (58,362) | £ (53,862) |
Deferred tax liabilities | 30,851 | 31,337 | 37,766 |
Net deferred tax asset | (30,935) | (27,025) | (16,096) | £ (26,550)
US |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax assets | (61,786) | (58,362) | (53,862) |
UK |  |  |  |
Analysis of deferred tax |  |  |  |
Deferred tax liabilities | £ 30,851 | £ 31,337 | £ 37,766 |

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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 2020-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2020-01-01 + Details
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