Only one stent? Not much to worry about then. I think I have three or was it five? I was very tentative first walks out, but everything kept working. (hope I am not tempting fate) The reason I suggested the Clwyds rather than the Lakes is, for instance, the main path up to the top of Moel Famau is just a moderate steady incline you can run up if fit, then followed by a series of small ups and downs, perfect training terrain. The northern section is a series of rises over old hill forts, all short. Always easy escape routes to the valley. But all worth while walks = the gentler routes in the Lakes tend to be fiddling about in a valley. Better scenery still around Llangollen on modest routes, over and under the Eglwyseg cliffs for instance, or the ridge walks above the Dee valley. En route from the northeast I suppose the Yorks Dales or Peaks are your best bet,gritstone edges or the Derwent reservoirs, bit of a jaunt across to the Welsh borders back of Chester. Keep optimistic, it is not the end of your active life.