If Shad knew what he was doing he might, if he was lucky, grow enough vegetables to feed himself vegetables for a few weeks. After that, say for the other 11 months, Shad will be joining all the other people who don't have an allotment plot, or a garden large enough to grow more than a few flowers if they are lucky, at the supermarkets, because most of the greengrocers have been pushed out of the market.
It's hard to get accross to many Americans here on BYC that the UK just doesn't have enough land at a price the vast majority can afford to even attempt self sufficiency.
https://www.oceanhome.co.uk/articles/february2023-market-snapshot#
With the majority of the houses in the Bristol area what one gets is a building with a postage stamp sized plot of land for £350,000. If I take a hard working couple I know whose combined yearly income is a bit over £60,000 then they would need to first get a mortgage for 6 times their annual salery (almost impossible) and even if the managed that, they couldn't grow any more than Shad does on an allotment plot.
The entire UK population can't just up sticks and move to the country and start living the good life. Even if they could wrest the land from the large landowners and get an affordable plot, the work required to to fully feed oneself would mean that at least one person from a couple would have to give up working at a job which they need to pay the mortage to work on the land.
I think it's great that some here on BYC can head in the direction of selfsufficiency but for the overwhelming majority of people it isn't a realistic or affordable option.