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Net borrowings - Reconciliation of movement in net borrowings (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
At beginning of the year £ 14,137 £ 12,109  
Net decrease in cash and cash equivalents before exchange 581 665 £ 231
Net increase/(decrease) in bonds and other borrowings 950 825  
Increase in net borrowings from cash flows 1,531 1,490  
Exchange differences on net borrowings (159) 334  
Other non-cash items 32 204  
Net borrowings at end of the year 15,541 14,137 £ 12,109
Cash outflow for derivatives designated in forward point hedges (2) (4)  
Non-cash items of fair value changes of CCS and IRS (34) (346)  
Non-cash items of lease liabilities (82) (183)  
Non-cash items of fair value change of borrowings £ 84 £ 331