The Peerless was a slab sided plastic bodied car. The GK is a less slab sided plastic bodied car, which endears itself to me only by the fact that it was the only car other than the MGA Twin Cam to use the Dunlop peg drive wheels using 4 pegs (Jaguar used a 5 peg version, normally in 16" diameter).
The GK wheels were also an inch wider than the Twin Cam wheels.
They built them on a shoe string and the chassis wasn't really up to the job in terms of handling, not helped by the choice of worm and sector steering system, but they maintain a following and most of them still exist. The chassis wasn't a Triumph based one, it was a bespoke square tube creation, not bad, actually, utilizing a de Dion rear suspension, and apparently they had a nice ride quality. See the club site for more info.
I look on them as a less powerful version of what my Jensen CV-8 was in that market.