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Intangible assets - Impairment tests for goodwill (Details) - Goodwill
12 Months Ended
Jun. 30, 2019
GBP (£)
item
Jun. 30, 2018
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) 2.00% 2.50%
Number of material cash generating units for impairment review | item 1  
Pre-tax discount rate (as a percent) 7.60% 7.80%
Percentage of increase in discount rate for sensitivity analysis 1.00%  
Impairment loss | £ £ 0