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Other investments - Narrative (Details) - GBP (£)
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of financial assets [line items]      
Loan guaranteed by subsidiary £ 40,000,000 £ 41,000,000 £ 49,000,000
Customers and third parties      
Disclosure of financial assets [line items]      
Allowances of loans made to customers and other third parties 113,000,000 127,000,000 111,000,000
Customers and third parties | Loans      
Disclosure of financial assets [line items]      
Loan guaranteed by subsidiary 3,000,000 4,000,000 17,000,000
Associates | Loans      
Disclosure of financial assets [line items]      
Loan guaranteed by subsidiary £ 7,000,000 £ 3,000,000 £ 0