If you (the fairly experienced at foraging and trapping etc.) were to go on a long hike for, lets say, a few months and hiked across the more remote locations of Britain, would you be able to survive on merely hunting and foraging for food? Would there be enough to survive happily while getting enough healthy food and energy to continue with your hike?
Donny, it depends on the season, I'm guessing however that when you asked the question you weren't thinking about the dead of winter
As falling rain has already pointed out, trapping would be tricky if you were planning to constantly be on the move. However if you were to stop occasionally until at least some of your trapping was successful, then I think you would have a less miserable time.
I don't see you being able to pick up the 3000+ kcals a day that you'd need easily, if at all. And the idea of doing whilst going somewhere just makes it harder...
I have some experience of this, it is practically impossible to get this much energy out of the environment here daily, however we are (I believe) designed to exist in a state of feast and famine, Three or four days into eating nothing but rosebay willow herb, birch polypore soup, beech mast etc. makes you feel quite sorry for yourself, however you are still more than able to keep the fire going and check the snares and lines etc.
With that said even if your trapping is successful, rabbits, hares or fish are still not hitting all the marks as far as nutrition goes.
.....and then you've got to get fresh water..............
I think water will be your biggest problem, if your going to carry a proper water filter and purification tablets maybe less so, but if you plan to go the primitive route things will be very hard.
So in answer to your question, probably not, but then if you or someone you know owns a huge chunk of Scotland and you could shoot red or fallow deer, fish with impunity in the lochs and rivers etc you'd probably have more of a chance