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Bosses believe their products will be less favoured by UK purchasers if they are forced to pay a premium on European products because of import tariffs.

They claim international wine producers like New Zealand, Australia and Chile, who have been backed by Wetherspoon chief and Brexiteer Tim Martin.

The publican warned European exporters they are at “extreme risk” because UK firms could easily alter their product lists to favour global free-trade agreements reached after Brexit.

Speaking to AFP, Cesare Cecchi, director of Italian firm Famiglia Cecchi wine cellar, said: “Clearly the level of taxation is a crucial element because if it increases the price of our wines too much, I mean European ones, they won’t be able to compete with other types of wine.