I also have a J H Classics DGT based on a Lancia Beta. You are correct in that J H Classics went out of business and Deon Cars started to make essentially the same car. I don't think Deon are around anymore but there is a company called Classic Replicas that makes a car very similar to that made by Deon.
I have a build manual that I can copy and send to you if haven't already got one.
Len
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