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Intangible assets - Impairment tests for goodwill (Details) - Goodwill	12 Months Ended
	Jun. 30, 2021 GBP (£) item	Jun. 30, 2020
Disclosure of information for impairment loss recognised or reversed for individual asset or cash-generating unit
Financial budget period	5 years
Terminal growth rate used to extrapolate cashflows (as a percent)	1.00%	1.50%
Number of material cash generating units for impairment review | item	1
Pre-tax discount rate (as a percent)	7.90%	7.50%
Percentage of increase in discount rate for sensitivity analysis	1.00%
Impairment loss | £	£ 0

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- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]]

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The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

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The number of material cash generating units for the purposes of the annual impairment review.

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Percentage of increase in discount rate for sensitivity analysis

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Represents the period of financial budget approved by management.

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