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Financial instruments and risk management - Schedule of net borrowings interest rate profile (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
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Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | £ 15,541 | £ 14,137 | £ 12,109
Net borrowings interest rate | 100.00% | 100.00% |
Fixed rate |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | £ 11,961 | £ 11,070 |
Net borrowings interest rate | 77.00% | 78.00% |
Floating rate |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | £ 3,225 | £ 2,612 |
Net borrowings interest rate | 21.00% | 19.00% |
Impact of financial derivatives and fair value adjustments |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | £ (93) | £ (20) |
Net borrowings interest rate | (1.00%) | 0.00% |
Lease liabilities |  |  |
Disclosure of financial instruments by type of interest rate [line items] |  |  |
Net borrowings | £ 448 | £ 475 |
Net borrowings interest rate | 3.00% | 3.00% |

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