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Working capital - Aged analysis of trade receivables net of allowances (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of trade and other receivables [line items]    
Trade receivables £ 2,155 £ 1,817
Not overdue    
Disclosure of trade and other receivables [line items]    
Trade receivables 2,114 1,771
Overdue 1 – 30 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 19 15
Overdue 31 – 60 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 8 8
Overdue 61 – 90 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 5 6
Overdue 91 – 180 days    
Disclosure of trade and other receivables [line items]    
Trade receivables 5 7
Overdue more than 180 days    
Disclosure of trade and other receivables [line items]    
Trade receivables £ 4 £ 10