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Segmental information - Geographic analysis (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of geographical areas [line items]      
Sales £ 23,515 £ 22,448 £ 19,153
Non-current assets 21,727 21,569 19,063
United States      
Disclosure of geographical areas [line items]      
Sales 6,972 6,327 5,441
Non-current assets 5,816 5,899 4,320
India      
Disclosure of geographical areas [line items]      
Sales 2,751 3,219 3,011
Non-current assets 1,798 2,396 2,561
Great Britain      
Disclosure of geographical areas [line items]      
Sales 2,138 2,142 1,822
Non-current assets 2,909 2,413 2,119
Rest of World      
Disclosure of geographical areas [line items]      
Sales 11,654 10,760 8,879
Non-current assets £ 11,204 £ 10,861 £ 10,063