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Net borrowings
6 Months Ended
Dec. 31, 2021
Borrowings [abstract]  
Net borrowings Net borrowings
31 December 202130 June 202131 December 2020
£ million£ million£ million
Borrowings due within one year and bank overdrafts(1,184)(1,862)(1,214)
Borrowings due after one year(12,693)(12,865)(14,063)
Fair value of foreign currency forwards and swaps122 169 117 
Fair value of interest rate hedging instruments4 63 146 
Lease liabilities(360)(363)(410)
(14,111)(14,858)(15,424)
Cash and cash equivalents1,780 2,749 2,763 
(12,331)(12,109)(12,661)