Regarding bread, just look at the ingretients. A long list of random stuff found on most supermarket or branded breads and they are packed full of chemical process. I've found some of the smaller brands of sourdough have a VERY small ingretient list. A few differentf flours (fortified is fine), water, salt. Shouldn't have anything else in it really (unless it's a seeded loaf obviously).
Nah the instore bakeries have very short ingredient lists (if that's what tickles your loaf)
e.g:
https://www.sainsburys.co.uk/gol-ui/groceries/bakery/from-our-in-store-bakery/c:1018834
Not all of it is baked in the store. The TTD loafs and pastries are frozen and rebaked or something. Small shops with obviously no bakery will have a freezer and a basic oven for a "bakery".
But a white bloomer is...
Fortified Wheat Flour (Wheat Flour, Calcium Carbonate, Iron, Niacin, Thiamin),
Water
Salt
Yeast (fresh yeast, I've bought it once from them)
Flour Treatment Agent: Ascorbic Acid (vitamin C?)
Also fortified is a legal requirement so people don't give themselves rickets or deformed babies whatever by eating bread from traditional white flour which processes out nutrients and needs further processes to add back in or even just add nutrients that the population is dodging in their diet.
Anyway, compare to a Hovis white loaf:
Wheat Flour (with added Calcium, Iron, Niacin, Thiamin),
Water
Yeast
Salt
Soya Flour
Preservative: E282
Emulsifiers: E472e, E471, E481
Rapeseed Oil
Flour Treatment Agent: Ascorbic Acid.
One of those loaves hardens up in a couple of days. The other will stay soft for weeks. The extra ingredients enable buying your daily bread once a week.