IFS website, 27 July 2017:

"Around 30% of food purchased by households in the UK is imported. The major source of total food imports is the EU (which accounts for 70% of gross food imports). This means changes in the costs of imports – for example, through changes to tariffs or movements in exchange rates – are likely to have a big impact on the price consumers pay for food." Plenty more pessimism where that came from too.

70% of our gross food imports come from the EU. NOT 70% of our food, of course. We do manage to produce some ourselves. It'll be interesting to see how much less we'll produce when we leave the EU, what with thousands of farms already on the brink and those subsidies drying up. Which they will, just like that £350 million a week for the NHS has already dried up. Maybe Theresa May will just plant a few more bogus forests or pay farmers a pittance to turn their land into crazy golf courses or hang bird feeders in the bushes.