v3.26.3
Intangible assets - Impairment tests for goodwill (Details) - Goodwill
12 Months Ended
Jun. 30, 2026
GBP (£)
item
Jun. 30, 2025
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% 2.00%
Number of material cash generating units for impairment review | item 1  
Pre-tax discount rate (as a percent) 10.10% 11.30%
Impairment loss | £ £ 0