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.

What has that to do with Brexit?
Because of EU we have to charge steep tariffs on food imports not from EU, which is most of it.
That will make 75% of our food imports cheaper, and EU will still need us to buy their food, wine and beer or they will be in trouble.