Its a 1953 Jowett Bradford Commercial Delivery van prototype based on the estate version. There was also a pick up version.
Yes, the Jowett Bradford CD Van is correct, though I've never seen the 'CD' meaning 'Commercial Delivery'! Actually I don't think it did as there were also a number of CD Estate Cars (puzzled here before), a couple of saloons and a pick-up made.
Below are pictures of the Estate Car and the saloon, but I can't find a proper picture of what the saloon looked like. I believe it resembled the Morris Oxfords of the mid-50s.