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Net borrowings - Maturity of gross borrowings before derivative financial instruments (Details) - GBP (£) £ in Millions | Jun. 30, 2022 | Jun. 30, 2021
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Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | £ 16,020 | £ 14,727
Within one year |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 1,522 | 1,862
Between one and three years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 2,817 | 2,623
Between three and five years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | 2,625 | 2,788
Beyond five years |  |
Disclosure of detailed information about borrowings [line items] |  |
Total borrowings before derivative financial instruments | £ 9,056 | £ 7,454

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