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Biological assets - Disclosure of reconciliation of changes in biological assets (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Reconciliation of changes in biological assets [abstract]    
Biological assets, beginning balance £ 66 £ 51
Exchange differences 10 2
Transferred to inventories (11) (7)
Fair value change (5)  
Farming cost capitalised 34 20
Biological assets, ending balance £ 94 £ 66