Income tax expense - Reconciliation of total tax expense (Details) - GBP (£) £ in Thousands	1 Months Ended	12 Months Ended
Apr. 30, 2023	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Reconciliation of the total tax expense
(Loss)/profit before income tax		£ (24,027)	£ (20,818)	£ 27,476
Loss/(profit) before tax multiplied by weighted average US federal corporate income tax rate of 21.0% (2020: 21.0%; 2019: 21.0%)		5,046	4,372	(5,770)
Tax effects of:
Adjustment in respect of previous years		663	(1,236)	1,085
Difference in tax rates on non-US operations		216	26	63
Recognition of UK R&D tax claims in respect of previous years			537
Foreign exchange (losses)/gains on US dollar denominated tax basis		(3,146)	735	1,311
(Expenses not deductible for tax purposes)/income not taxable		(526)	757	(845)
Impact of change in UK Corporation tax rate		(77,785)
Unrealized foreign exchange gains/(losses) not taxable in the US		7,343	(3,690)	(2,248)
Re-measurement of foreign tax credit US deferred tax asset			(3,916)	(2,191)
Total income tax expense		£ (68,189)	£ (2,415)	£ (8,595)
US
Tax effects of:
Corporate tax rate		21.00%	21.00%	21.00%
UK
Tax effects of:
Corporate tax rate	25.00%	19.00%

The applicable income tax rate.

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The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit]

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