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Net borrowings - Bonds issued and repaid (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Schedule of bonds issued and repaid [line items]      
Repaid £ (1,521) £ (1,247) £ (820)
Bonds issued and repaid 742 (216) 4,368
€ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 1,371 636 1,594
Repaid (769) (696) 0
£ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 892 395 298
$ denominated      
Schedule of bonds issued and repaid [line items]      
Issued 0 0 3,296
Repaid £ (752) £ (551) £ (820)