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Net borrowings - Reconciliation of movement in net borrowings (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
At beginning of the year £ 12,109 £ 13,246  
Net decrease in cash and cash equivalents before exchange 665 231 £ (2,552)
Net increase/(decrease) in bonds and other borrowings 825 (967)  
Increase/(decrease) in net borrowings from cash flows 1,490 (736)  
Exchange differences on net borrowings 334 (598)  
Other non-cash items 204 197  
Net borrowings at end of the year 14,137 12,109 £ 13,246
Cash outflow for derivatives designated in forward point hedges (4) (2)  
Non-cash items of fair value changes of CCS and IRS (346) 249  
Non-cash items of lease liabilities (183)    
Non-cash items of fair value change of borrowings £ 331 £ (111)