Okay.
1st i removed the subframe from the bottom of a spare set of seats (took about 45 mins)....I've still got my original SE leather seats in tact should I want to sell the car...
Then I ground off all of the bits from the subframe that I didn't need, which were mainly the side mounts for the backrest.
the subframe has it's own cross-members so is fairly rigid without the seat.
I had already ground off the runners from the Golf seats leaving the rear bar (which was a perfect fit between the A2 runners at the rear. I used a high-tensile threaded bar through this to fix the seat at the back (the rear runner fixing is hollow so I used several perfectly sized washers in 3 places to stop the bar moving in the tube)
At the front I drilled 2 holes through the front bar on the cross member to receive a U-bolt to secure the front.
I had to grind a channel to receive the front cross-member, but this gives support to the seat.
Not ideal but a workable, and most definitely safe solution.
The seat height still works, although I now have a seat that goes about 2 inches further back (and obviously 2 inches less forward), but that suits me better.
I'll take a picture.......off to get phone...
Voila..
Hope this helps
J
Also to note the heated seats and airbag are plug and play...yippee..