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Other investments (Tables)
 12 Months Ended
Jun. 30, 2023
Disclosure Of Noncurrent Investments Other Than Investments Accounted For Using Equity Method [Abstract]  
Schedule of movements in other investments
Loans
£ million
Other investments
£ million
Total
£ million
Cost less allowances or fair value
At 30 June 202110 30 40 
Exchange differences2 1 3 
Additions6 9 15 
Repayments and disposals(1)(1)(2)
Fair value adjustment— (13)(13)
Step acquisitions— (6)(6)
Capitalised interest1 — 1 
Transfer— (1)(1)
At 30 June 202218 19 37 
Exchange differences(1)— (1)
Additions20 9 29 
Repayments and disposals(3)— (3)
Fair value adjustment— (4)(4)
Capitalised interest1 — 1 
Impairment charged during the year— (2)(2)
At 30 June 202335 22 57