I'm presuming you didn't use Dave's buffers, as he doesn't do flat topped LMS coach buffers, who's did you get ? I've used either the Comet or 247 standard ones and filed the flat on.
As a further aside, when did bogie CCT's start being called GUV's?, confuses the hell out of me cos I call the Lima model the former and everyone else seems to call it the latter, even though 4 wheel CCT's still are CCT's
Mike