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Other investments - Narrative (Details) - GBP (£) £ in Millions | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2021
--- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | £ 57 | £ 37 | £ 40
Customers and third parties |  |  |
Disclosure of financial assets [line items] |  |  |
Allowances of loans made to customers and other third parties | 121 | 129 | 113
Customers and third parties | Loans |  |  |
Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | 6 | 6 | 3
Associates | Loans |  |  |
Disclosure of financial assets [line items] |  |  |
Loan guaranteed by subsidiary | £ 29 | £ 12 | £ 7

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