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Biological assets - Disclosure of reconciliation of changes in biological assets (Details) - GBP (£)
£ in Millions
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Reconciliation of changes in biological assets [abstract]    
Biological assets, beginning balance £ 94 £ 66
Exchange differences 15 10
Transferred to inventories (8) (11)
Fair value change 0 (5)
Farming cost capitalised 55 34
Biological assets, ending balance £ 156 £ 94