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Segmental information - Geographic analysis (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of geographical areas [line items]      
Sales £ 22,448 £ 19,153 £ 17,697
Non-current assets 21,569 19,063 19,921
United States      
Disclosure of geographical areas [line items]      
Sales 6,327 5,441 4,839
Non-current assets 5,899 4,320 5,028
India      
Disclosure of geographical areas [line items]      
Sales 3,219 3,011 2,783
Non-current assets 2,396 2,561 2,758
Great Britain      
Disclosure of geographical areas [line items]      
Sales 2,142 1,822 1,684
Non-current assets 2,413 2,119 1,911
Netherlands      
Disclosure of geographical areas [line items]      
Sales 89 70 62
Non-current assets 2,600 2,474 2,661
Rest of World      
Disclosure of geographical areas [line items]      
Sales 10,671 8,809 8,329
Non-current assets £ 8,261 £ 7,589 £ 7,563