Wasn't the order line for a new Camprite running at about 18 months not so long ago? 4 months doesn't sound so bad in comparison! JT rushed our Trackabout order through for us, but that was still 2.5-3 months from memory.
Bulldog - I've not heard of them, but I think you've done the right thing by getting in contact with them and having a chat. Goodness knows there's a million things that can go wrong over the course of 5 months - some of the delays could be their fault, but some could be completely out of their hands - supply issues, third parties stuffing them around, just plain busy, you never know.
Think of it this way - once you've got the camper, the extra month's wait will be a small price to pay, and soon forgotten in the many years of enjoyment that you'll have camping around this big country!
Good luck with the wait - I know it's painful now, but it'll all be worth it soon!
Matto