http://trackdevelopments.co.uk/contact
Dave Gallop is the man to speak to.
I think it's fair to say I have V1 full geometry change, and John I has V2.
The primary difference between V1 and V2 is that V1 requires chassis modifications, and V2 doesn't.
At the risk of sounding like a broken record, the difference between the Marlin dynamic geometry and the TD geometry is night and day on the road. The way my car handled from factory was utterly hideous.