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Working capital - Trade and other receivables (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of trade and other receivables [line items]    
Trade receivables £ 2,011 £ 2,155
Current assets    
Disclosure of trade and other receivables [line items]    
Trade receivables 2,011 2,155
Interest receivable 12 18
VAT recoverable and other prepaid taxes 271 290
Other receivables 163 158
Prepayments 229 290
Accrued income 34 22
Trade and other receivables 2,720 2,933
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 15
Other receivables 13 13
Prepayments 3 9
Accrued income 0 0
Trade and other receivables £ 31 £ 37