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Financial instruments and risk management - Interest rate risk - Narrative (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings percentage | 100.00% | 100.00%
Fair value hedges | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 3,999 | £ 4,444
USD LIBOR | Fair value hedges | Interest rate risk |  |
Disclosure of detailed information about financial instruments [line items] |  |
Notional amounts | £ 2,063 | £ 2,893
Fixed rate |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings percentage | 77.00% | 78.00%
Minimum | Fixed rate |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings percentage | 40.00% |
Maximum | Fixed rate |  |
Disclosure of detailed information about financial instruments [line items] |  |
Borrowings percentage | 90.00% |

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