so where abouts in the country would provide a sufficient amount of food to keep some one going for a reasonable amount of time?
by that I mean an area with many many resources, so meat, fish, shellfish, nuts, fruit?
IMO all of these would be required.
Problem is so much of the 'wild' food in the UK is seasonal so as a lone hunter gatherer you are up poo stream without a paddle. On your own there are not enough hours in the day to carry out all thats required, hunting, drying, storing, growing, guarding etc, plus having to move often to source your different foods in the first place. Remove motorised transport from the equation and your options for mobility shrink dramatically; how many miles a day can you walk out and back to camp in the hope of catching food, then prep it, preserve it, eat it?
You could 'survive' quite a while but long term your prospects of survival dwindle unless you are part of an organised group. Solo survival means really just getting by until you can join up or form a group IMHO.
Those of us who 'prep' have a head start, I have several months of food, clean water etc but locally apart from sheep and rabbit there is not a lot to munch on as things stand now.
Perhaps a better question would be "Whats the minimum size of group needed to survive an end of the world situation"