The unfortunate thing is, and I think it's a shameful indictment on our society not the individuals who do forage that way, that there are people who rely on such 'bins' for their dinner
Wild foraging, in the UK isn't quite as straightforward as it might be.
Those who did so in the past weren't limited in their range or their habitat zones, but followed the seasonal round. They were also omnivores….and as a good vegetarian I freely admit that I would be very lean very quickly indeed.
Mrcharly's right about the fat thing. We don't grow olives here, and nuts are a bit hit or miss (though we do know that hazelnuts were gathered and consumed by the million in the past). That leaves fish, fowl and animal fats.
Most of our mesolithic ancestors lived on coastal or riverine areas….not hard to find in the UK and assorted islands
There's always shellfish, and again they seemed to have been gathered by the million going by the sheer number and size of shell middens.
Wildfowl though, good eating, rich in fat and protein…if you don't just cherry pick off the breasts that is. Those who prepare the birdskins for tanning worked the inside skins in their mouths, and the ladies said that they grew fat on it. Fat enough to healthily carry and feed babies.
Nowadays ? in our overpopulated and fragmented countryside, even in Scotland with the rights of responsible access, it's not always easy.
Best advice is to pay heed to the season and be aware of what's growing/living where and when for next year, I reckon
M