I agree that there's nothing to suggest that First Group is in trouble. Of course, all across the rail division there have been cuts in the cost base, as Lockhead himself boasted about last year. As such I wouldn't rule out First GBRf being sold if a good bid was received, but I don;t think it should be seen as evidence of a company going to the wall.
In respect of First Cymru, they have pulled out of certain routes recently, but this is something they do from time to time. According to a contact in the company, they don't tender for subsidised routes that they don;t consider worthwhile, allow Veolia to run them, make a mess of it, then pick the route up again at a more realistic level afterwards. IIRC, a similar thing happened a few years ago, just before the recession began, six months later they were aggressively competing again!