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Taxation - Unrecognised deferred tax assets (Details) - GBP (£)
£ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Gross value of tax losses which has not been recognised £ 708 £ 809
Unrecognised deferred tax assets 178 176
Capital losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 105 76
Trading losses – indefinite    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets 23 30
Trading and Capital losses – expiry dates up to 2030    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unrecognised deferred tax assets £ 50 £ 70