Again, I don’t mean this to be combative, please don’t take my comments as so.
I highlighted wheat since that’s the one you said you grew the most of, so presumably that’d be the main part of your planned diet. And you haven’t mentioned that you plan to mill and refine it, but did mention you tested boiling it. I am honestly curious if you’ve tried living on exactly the foods you plan to grow in the forms you plan to process them into, because as best I can tell, you haven’t.
It would rule out sweet potatoes, for example, since in the UK you need special soil and a greenhouse to reliably get sweet potato crops as they require a very long, hot, sunny growing season and very well drained soil–even here in eastern North Carolina the harvest for greenhouse-started sweet potatoes isn’t ready until right around first frost, and our climate is subtropical.
It’s also important that you are aware of the differences in processing. As snarfing is trying to point out, grains are deficient in niacin, and almost all grains you eat have niacin added in some way or other. Going back to the example of wheat, I mentioned the boiled berries because even chemically speaking, wheat berries and wheat flour are extremely different. Commercial white wheat flour, if dry, is mostly starch, has a long shelf life and is fortified with iron and niacin. Wheat berries, on the other hand, are more nutritious in theory, as it still contains dietary fiber, some (but less than fortified flour) iron and niacin, and a bit more protein and healthy fats than flour. However, the shelf life is shorter. The issue is the fats, wheat has a high proportion of polyunsaturated fats in the outer portions of the berry, which after prolonged storage oxidize, giving the wheat a strong rancid flavor and making them quite unhealthy to eat (lots of oxidative stress, there’s a reason our bodies instinctively don’t want to eat oxidized, ie rancid, fats–they’re bad for you). Mold is the other issue, as the heat of the milling process helps dry the wheat and dramatically reduces the chances of mold formation, making flour a considerably safer storage option than unmilled grains. Look into the history of flour, there’s actually quite a lot of useful (and potentially life-saving!) information as to why things are done the way they are and why fortified white wheat flour specifically is the most common form now.
That’s just the example of wheat. There are similar intricacies and subtleties to almost everything you’ve mentioned. Are you aware of which legumes are safe to eat raw and which ones contain potent neurotoxins that are only rendered safe by prolonged cooking at high temperature? A dozen undercooked beans of the wrong variety can literally kill an adult human. Eating too much corn can give you pellagra. Eating even modest quantities of broad beans aka fava beans can cause hemolytic anemia in certain people. Rickets, cheilosis, goiter, beri-beri, Menke’s disease, etc. are all very unpleasant things that result from imbalanced diets. To avoid them, you either need to research them all extensively and research the nutrient profiles of the things you plan to grow, or you need to conduct real life tests. These aren’t gotcha’s, these are FYIs, and of serious import.
This is why I want to know if you’ve tested your plans in real life. Your current diet has very little resemblance to the diet you’re talking about producing for yourself. You are eating plants that you yourself can’t grow, and even of the ones you can grow, you’re likely eating them in forms that have been significantly processed to alter their nutritional composition.
Again, don’t take what I’m saying as the attacks of a “naysayer.” Take it as the comments from someone who is trying to point out the blind spots you might have and the information that you seem to have missed.