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Net borrowings - Maturity of gross borrowings before derivative financial instruments (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022
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Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | £ 16,502 | £ 16,020
Within one year |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 1,701 | 1,522
Between one and three years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 3,522 | 2,817
Between three and five years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 2,874 | 2,625
Beyond five years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | £ 8,405 | £ 9,056

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