If you're gonna play in and around N.Wales I can tell ya you won't do some of the byways, the snow drifts are too deep up in them thar hills, certainly around Denbigh. I was up there 30th December, drifts were approaching 4ft deep so you can't get enough speed to push through going up hill especially if you've got green ice under the snow. As far as I know the Wayfarer is still closed (i've not heard otherwise). Clocaenog may be doable.
Hope that helps ya.