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Intangible assets - Narrative (Details) - India - GBP (£)
£ in Millions
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of information for cash-generating units [line items]    
Pre-tax discount rate % 13.00% 14.00%
Old Tavern brand    
Disclosure of information for cash-generating units [line items]    
Impairment charge £ 59