I think we have huge misconceptions about the lifestyle of hunter gatherers, and I think that is what drives the huge volume of threads like this one.
I think most people are on the same page with respect to the OP, that a single person can not live in the current UK through hunting and gathering. But, let's leave aside all considerations of legality, lack of space, etc. and imagine a small community living through hunting and gathering without any external limitations.
As petrochemicals pointed out, there is a large difference between edible plants and food. While we can keep listing plants that are edible, and in a survival situation they are better than nothing, you can not support a population or an individual on them long term.
There are other plants that will in fact provide sufficient calories to live long term. Ray Mears had a good series on Wild Foods in the UK.
What can be seen from that show however, as well as from a closer study of our ancestors is that hunting and gathering very closely resembled farming. We tend to have this romantic assumption that a hunter/gatherer would just wake up in the morning, and when he got hungry, he would just go pick some dandelions, and then cook them on the fire while carving a spoon. The reality was nothing like that. The plants that actually provided food were closely monitored, and when they were in season, they were harvested and preserved in large quantities and on a communal scale. It was not uncommon to move the whole village to a location where a crop was available for its processing. The crop then provided the food until the next crop came into season. These were large scale communal efforts that closely resembled the later harvesting of planted crops.
Similarly, hunting was not just a matter of skill and luck. Over time a tribe would develop specific knowledge of game availability and movement in every area frequented by the tribe. Much like a modern hunter who hunts the same plot of land, they knew exactly when game passes through the area, and its exact path.
So, can a person survive alone in the UK today? My answer would be "no". If we removed all restrictions of legality, space, etc, then could he? Anything is possible, although I would call it extremely unlikely just because so much depends on luck. A single injury or illness that leaves you unable to procure food will end it for you; and how many of us have never had an injury? A community could certainly live just fine (again, assuming all restrictions are removed), but the way it was most likely done by our ancestors is not exactly what we seem to imagine when we dream of hunting and gathering.
I think most people are on the same page with respect to the OP, that a single person can not live in the current UK through hunting and gathering. But, let's leave aside all considerations of legality, lack of space, etc. and imagine a small community living through hunting and gathering without any external limitations.
As petrochemicals pointed out, there is a large difference between edible plants and food. While we can keep listing plants that are edible, and in a survival situation they are better than nothing, you can not support a population or an individual on them long term.
There are other plants that will in fact provide sufficient calories to live long term. Ray Mears had a good series on Wild Foods in the UK.
What can be seen from that show however, as well as from a closer study of our ancestors is that hunting and gathering very closely resembled farming. We tend to have this romantic assumption that a hunter/gatherer would just wake up in the morning, and when he got hungry, he would just go pick some dandelions, and then cook them on the fire while carving a spoon. The reality was nothing like that. The plants that actually provided food were closely monitored, and when they were in season, they were harvested and preserved in large quantities and on a communal scale. It was not uncommon to move the whole village to a location where a crop was available for its processing. The crop then provided the food until the next crop came into season. These were large scale communal efforts that closely resembled the later harvesting of planted crops.
Similarly, hunting was not just a matter of skill and luck. Over time a tribe would develop specific knowledge of game availability and movement in every area frequented by the tribe. Much like a modern hunter who hunts the same plot of land, they knew exactly when game passes through the area, and its exact path.
So, can a person survive alone in the UK today? My answer would be "no". If we removed all restrictions of legality, space, etc, then could he? Anything is possible, although I would call it extremely unlikely just because so much depends on luck. A single injury or illness that leaves you unable to procure food will end it for you; and how many of us have never had an injury? A community could certainly live just fine (again, assuming all restrictions are removed), but the way it was most likely done by our ancestors is not exactly what we seem to imagine when we dream of hunting and gathering.