The trouble with these Interfrigo vans from Acme / Marklin / Rivarossi etc is that they just don't look like the vans that visited the UK.
Electrotren used to make a model of the ferry van version . I found a couple on Ebay that carried the Transfesa branding (there are photos of these at Paddock Wood too), but they also made a version in Interfrigo livery (Google for Electrotren 1478k). Unfortunately I have only found one of those for sale online, and can't get a response from the seller!
Here's a picture for comparison:
The UK version has a slight overhang on the roof, and a riveted strip along the top of the sides. It also has a more pointed roof (the top panel is much narrower than on the standard wagon, but I couldn't get a clear photo of that!)
Unfortunately, being HO, the Electrotren model is also a bit too small, but possibly wouldn't look out of place marshalled with other HO ferry vans.
Here's a comparison with a VDA van:
One day I might scratchbuild a rake of these but it doesn't look like the easiest job in the world to get right!
Mal