Low end transporters will most probably not have them, higher end will.
I.E. Transporter mostly not, Caravelle, Multivan, California should normally have one.
I don't know about the UK, but as they use a more low end version of the Transporter (Transporter dashboard), it might be possible they didn't fit it from factory, but I would doubt it.
You could check the bolt holes. If the thread is rusty, then there should have been a cover, if the threads are ok'ish (age of van?), then there has never been one on.