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Working capital - Trade and other receivables (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of trade and other receivables [line items]    
Trade receivables £ 1,817 £ 1,498
Current assets    
Disclosure of trade and other receivables [line items]    
Trade receivables 1,817 1,498
Interest receivable 35 29
VAT recoverable and other prepaid taxes 216 192
Other receivables 148 210
Prepayments 150 157
Accrued income 19 25
Trade and other receivables 2,385 2,111
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 18 13
Other receivables 18 31
Prepayments 0 2
Accrued income 0 0
Trade and other receivables £ 36 £ 46