Given the constraints on finance for the forseeable future, maybe it has to be an engine that either is in relatively good order, or will at least find ready use as an hire-out loco, earning its keep. In terms of mechanical condition it might be "luck of the draw" with engines like 42500, which presumably was preserved simply as the first of the class, not necessarily the one in the best overall condition? At 92 tons it might be a bit heavy for some Heritage lines as well. I'll go with the Midland Compound as my choice. I agree overall though about seeing more 4-4-0s returned to steam if at all possible.