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Working capital - Trade and other receivables (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Disclosure of trade and other receivables [line items]    
Trade receivables £ 2,155 £ 1,817
Current assets    
Disclosure of trade and other receivables [line items]    
Trade receivables 2,155 1,817
Interest receivable 18 35
VAT recoverable and other prepaid taxes 290 216
Other receivables 158 148
Prepayments 290 150
Accrued income 22 19
Trade and other receivables 2,933 2,385
Non-current assets    
Disclosure of trade and other receivables [line items]    
Trade receivables 0 0
Interest receivable 0 0
VAT recoverable and other prepaid taxes 15 18
Other receivables 13 18
Prepayments 9 0
Accrued income 0 0
Trade and other receivables £ 37 £ 36