Right, I now have a GTV drivers seat fitted!
The bad news is that I followed the instructions on the website that Greek posted and they tell you to re-fit the 20mm spacers between the seat and the runners...unfortunately because I'm tall that means that I have to kink my head over at an angle to sit in the seat!! Which means it'll have to come apart again to remove them...about a 2hr job now I know what I'm doing.
Didn't take any photo I'm afraid, but I will when I do the passenger seat. It's pretty much as per the link Greek posted anyway, but you do have to be brave because it requires you to rip off the seat base foam (gently, but you have to do it). Doesn't matter though, because the tension of the leather over the top holds it in place anyway.
Another thing thats a little tricky is that the link doesn't really show you where to drill the new holes, so I had to figure that out. It's not straightforward because although the bottom face of the seat is pretty much flat, the internal part isn't, so it's almost impossible to find anywhere that you can tighten a nut down onto a nice flat surface.
Anyway, I'll post up more details when I do the passenger side.