Foodies Prepare for Brexit?

There has been a spate of stories about people attempting to grow high value food ingredients in the UK. I have recently heard about the growing of the flowers to produce the spice, saffron (repeatedly said to be 'more valuable than gold on a weight for weight basis'). Other folk are encouraging the growth of black truffle fungi in the root systems of imported oaks. Tea is now grown in Cornwall. This, of course, is not to mention the activities of British vineyards.