Dapol's has the 'A' frame ends. There are a good half dozen different styles of end, although I don't recognize the one you have there in any UK photos I've seen of an IWA/B. Both the IW and IWB have different roofs to your van. I think your van is one of the DB steel carriers (ILE690 "Holdall"). They used to run through the chunnel to Wolverhampton in the 1990s. If you remove most of the body and add stakes you get a Colas timber carrier from it, which is I believe where they all went !
If you want a "distinctive" van then the IZA and IVA are four wheel ferry vans which I keep thinking I should do but please beat me to it!
Alan