Nomads still survive in siberia. The nenet tribe follows herd of reindeer. They eat reindeer meat, wear reindeer fur, make tents from reindeer pelts, etc etc, and presumably have been doing so for a very long time.

as for pre-historic peoples in the area that came to be england and ireland, here is a resource about various tribes that lived in that area. as to how they lived, it would have depended on what resources were available to each tribe based on the specific geography and ecosystem of the area in which they resided. prior to the widespread use of agriculture, which only began about 10,000 years ago (compared to the couple hundred thousand years of human existence), people lived as hunter gatherers. they hunted wildlife and foraged wild plants for food, built make shift structures out of animal skins, trees, and rocks. some were nomadic, some more sedentary. the specifics of how each group of people lived varied widely, and depended largely, again, on what particular resources were available to them based on where they lived.