Tim/Mark, OY...
Yep, its a race unit' so doesnt have the cut out for the standard seat pad, so I'll be looking into some high-density foam padding to take the weight onto the sub-frame, and then a foam pad for the seat.
Thanks for all your help chaps. If anyone does have a few piccies on their PC to hand then would help, but think I'm set for what I need to do.
Just need to find the time to sort it all