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Taxation - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Income Taxes [Abstract]      
Current tax asset £ 149 £ 145  
Current tax liabilities 252 146  
Provision for tax uncertainties 156 129  
Income taxes paid, classified as operating activities 949 852 £ 901
Difference between current tax charge and cash tax paid 100 (39)  
Deferred tax assets 114 100  
Deferred tax assets arising in jurisdictions with prior year taxable losses 47 48  
Unrecognised temporary differences in respect of investments in subsidiaries, branches, interests in associates and joint ventures £ 21,000 £ 16,400