2007 update step forward Dennis Benson! Dennis has confirmed that KC1 has indeed expired although some parts from it do still exist so a paperwork rebuild is feasible. So there you are KC2 is the oldest extent, complete GT6 in existence, it's official!
Dennis Benson is a long time GT6 enthusiast who (along with John Kipping) did much research into the early cars many years ago. Dennis has been off the scene for many years playing with trains, but has recently returned to the Triumph fold with plans to restore his prototype GT6 chassis number KC6.