Scoured ridges and southern aspects mean running conditions are pretty fast underfoot in these areas but very icy... anywhere else that is not already trampled by walkers pretty slow going through drifts. Snow still not consolidated and no crust so the shins are ok
Best options are tourist routes up snowdon with nice trampled paths from walkers - watch the ice on the bad step of the Llanberis path though! - the miners track from pen y pass is an absolute joy - even if just for a short blast up to Llyn Glaslyn. Moel Eilio is also a great run in the snow.
Haven't needed crampons just yet but did need my inov8 o-rocs and have defo needed the ice axe
http://sarzmountainrun.blogspot.co.uk/2013/01/enjoying-white-stuff.html