Hi Simon,
Good work on the Crab; I hope you didn't loose too many drills doing the handrails!
The Farish single vent van is a late '30s LNER design (in fact the same as the one recently done in 4mm by Bachmann) so is 17'6" long on a 10' w.b. That looks like the later version of the body. There are a couple of isues with this: the lamp bracket is very tall (not too hard to sort with a sharp knife and some filing) and the sliding door is moulded flush with the side instead of being stepped out. Oddly the earlier tool Farish used was correct in both respects, though the detail is a little neater on the later body. I scored down the sides of the door and underneath the side with a sharp knife and took it out, sticking it back in place a 10 thou." further out. Many that were originally unfitted would have had vac. brakes added in the late 1950s, so 'standard' 4 shoe brakes are OK. Those that were built fitted would have clasp brakes to the standard LNER pattern.