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Other investments - Narrative (Details) - GBP (£) | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2020
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Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | £ 37,000,000 | £ 40,000,000 | £ 41,000,000
Customers and third parties |  |  |
Disclosure of financial assets [line items] |  |  |
Allowances of loans made to customers and other third parties | 129,000,000 | 113,000,000 | 127,000,000
Customers and third parties | Loans |  |  |
Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | 6,000,000 | 3,000,000 | 4,000,000
Associates | Loans |  |  |
Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | £ 12,000,000 | £ 7,000,000 | £ 3,000,000

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