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Taxation - Unrecognised deferred tax assets (Details) - GBP (£)
£ in Millions
Jun. 30, 2023
Jun. 30, 2022
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross value of tax losses which has not been recognised £ 632 £ 674
Unrecognised deferred tax assets 161 169
Capital losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 98 98
Trading losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 24 25
Trading and capital losses – expiry dates up to 2032    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets £ 39 £ 46