I'm not sure how, but I managed to get a private surgeon and private hospital for chest surgery via the NHS. Looks like it will all be sorted by the end of this month, and I'll have the surgery in March. Think I'll make it down to my ideal weight by then, or won't be far off it. Glad the uncertainty's over. Had my first consult chest photos taken and some discussion with the surgeon, so that's a weight off. Also managed to drive to the place and back without being stuck behind a farm vehicle or at roadworks.