Official confirmation: it is indeed Gerry's Achnashellach Lodge. Quite an eccentric chap, Gerry, but the lodge was fab. The Nottingham Uni Mountaineering Club were staying there at the same as I wandered through; they'd had the place to themselves for a week and Gerry came over all houseproud when I stayed, insisting that they clear all the empty booze bottles away. I was just glad to stay indoors, especially as there was snow overnight.