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Other investments - Movements in other investments (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Disclosure of financial assets [line items]    
Beginning balance £ 40 £ 41
Exchange differences 3 (3)
Additions 15 5
Repayments and disposals (2) (1)
Fair value adjustment (13)  
Step acquisitions (6)  
Capitalised interest 1  
Transfer (1) (2)
Ending balance 37 40
Loans    
Disclosure of financial assets [line items]    
Beginning balance 10 7
Exchange differences 2 0
Additions 6 5
Repayments and disposals (1) (1)
Fair value adjustment 0  
Step acquisitions 0  
Capitalised interest 1  
Transfer 0 (1)
Ending balance 18 10
Others    
Disclosure of financial assets [line items]    
Beginning balance 30 34
Exchange differences 1 (3)
Additions 9 0
Repayments and disposals (1) 0
Fair value adjustment (13)  
Step acquisitions (6)  
Capitalised interest 0  
Transfer (1) (1)
Ending balance £ 19 £ 30