My first trike in 1994 was a Crystal Engineering Trice.
It arrived in the first week of June 1994 and I got sent down to RNAS Culdrose the following week on a short notice draft, so rode it down!
Here is the machine outside the Sick Bay at Culdrose
The quality was a little haphazard as the frames wee produced by a Sixth Form metalwork class at a Cromer School (allegedly) - however if you got a good frame they were OK
I am familiar with the picture you posted Cunobelin - as it was one of the first images I found when I did a Google search to find out a bit more about the Trice.
Mine is in the same red and I believe it to be a Circa 1995 model with a slightly different rear end to your one.
Kevin at DTec gave me some information and also informed me of the possibility that my Trice could have been constructed by a Norfolk schoolboy.
I checked the frame carefully when I collected it and all is in good order and the welding is of a good standard.
As my shoulders are getting worse rather than better, I am now pretty much certain that my future cycling will all be on a recumbent trike so I am saving for something more recent and lighter......
One of the main issues is the 20" 451 wheels - which I cannot seem to get any tyres for, that offer the kind of P protection that Schwalbe Marathons do.
Last Sunday was good as I cycled out with a group and they, being on standard bicycles, had to go slowly due to the amount of black ice - whereas I had no fear of falling off (but had great fun sliding round corners!)
Some pics of my old bus below show the weld quality.