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Working capital - Aged analysis of trade receivables net of allowances (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of trade and other receivables [line items]    
Trade receivables £ 1,817 £ 1,498
Not overdue    
Disclosure of trade and other receivables [line items]    
Trade receivables 1,771 1,379
Overdue 1 – 30 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 15 5
Overdue 31 – 60 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 8 23
Overdue 61 – 90 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 6 39
Overdue 91 – 180 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 7 39
Overdue more than 180 days    
Disclosure of trade and other receivables [line items]    
Trade receivables £ 10 £ 13