Brexit will give us cheaper food.

In your dreams PAL! With the world population rising inexorably, and the sources of cheap food becoming more affluent because they are supplying cheap food, currently, and thus better able to feed themselves and will ........... you work it out in your more lucid waking moments.

And then there is the BRICS becoming more affluent. (aka food waste).

And Brexit is bringing us food price rises in the short term. And in 40 years we have gone from spending 18% of income on food to 11% currently. Funded by under-nourished Africa.

And I didn't mention global warming moving the deserts further to the poles, and crop yields diminishing with rising temperatures, and the insect world changing their habits and, and ..........

Of course science will come to the rescue, it always will. But it may just be more vegetarian. AND vitamin B12 pills or in the food by legislation. Remember calcium, aka chalk, in bread? Thought not! I don't remember that WW2 UK law being repealed.