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Net borrowings - Bonds issued and repaid (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Schedule of bonds issued and repaid [line items]      
Repaid £ (1,340) £ (1,521) £ (1,247)
Bonds issued and repaid 889 742 (216)
€ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 441 1,371 636
Repaid 0 (769) (696)
£ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 0 892 395
$ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 1,788 0 0
Repaid £ (1,340) £ (752) £ (551)