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The pink/blue insulation foam is pretty easy to work with, especially if you've got a hot wire cutter (I don't, but I manage just fine). It comes in a few thicknesses, but you can always stack layers to get your desired height. Not sure about the UK, but here, it's available at any of the numerous big box home improvement stores. If all else fails, plain old styrofoam can work, in a pinch, as long as you coat it well (both for aesthetics and for strength).
If you're looking for easy trees, check out Woodland Scenics. They sell everything you could need, from snow flock to tree blanks and foliage to ready-to-go winter diorama kits. Just be sure you buy something in the proper scale, as you can get trees in the exact same style anywhere from 3-8" tall.
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