I'll have a drive over to where he lives in the week...depends on when my new medication arrives.
You could also give Graham Sheppard (of Hunter Systems in Eastbourne) a call, as far as I know Graham bought Aspen Electronics from Dennis...Dennis was the chap who built these radios, he formed Aspen Electronics. When his marriage folded, he moved away and Graham bought the company from him.
I'll not put Graham's phone number up here, although it's well known everywhere...either pm me or just search for Hunter Systems on the web.
I can tell you that it was amazing stuff, he made me a very special tx for my Patrick Henry...I can't remember exactly how many functions it had now, it was a lot of years ago, but it did so many things I had to have a function list printed up and attached to a cord around my neck so I had a quick reference close by. These radios could be custom built to suit a customer's requirements, you could have the sticks, switches and knobs put where you wanted them in the case. You could specify any number and combination of controls in more or less any position and he would do it. He was a very clever chap, was Dennis...but he wasn't much good at being married. (mind you, neither was I, but that's another story)
(ps...just remembered Dennis's surname...Ursell. Strange surname, strange person)