The United Kingdom Government has releases the statistics for agriculture. Some interesting information can be found in this report, like the yearly production of potatoes and several fresh fruits and vegetables, but also the supply in terms of imports and exports and prices per ton.
These statistics can be found in this report, by clicking on the tabs 7.9 (fresh vegetables), 7.11 (potatoes) and 7.12 (fresh fruits).
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Source: Gov.uk