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Other investments - Movements in other investments (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Disclosure of financial assets [line items]    
Beginning balance £ 41 £ 49
Exchange differences (3) 2
Additions 5 3
Repayments and disposals (1) (3)
Fair value adjustment   2
Provision charged during the year   (14)
Capitalised interest   1
Transfer (2) 1
Ending balance 40 41
Loans    
Disclosure of financial assets [line items]    
Beginning balance 7 17
Exchange differences 0 1
Additions 5 3
Repayments and disposals (1) (1)
Fair value adjustment   0
Provision charged during the year   (14)
Capitalised interest   1
Transfer (1) 0
Ending balance 10 7
Others    
Disclosure of financial assets [line items]    
Beginning balance 34 32
Exchange differences (3) 1
Additions 0 0
Repayments and disposals 0 (2)
Fair value adjustment   2
Provision charged during the year   0
Capitalised interest   0
Transfer (1) 1
Ending balance £ 30 £ 34