Hi David,
In addition to the thread highlighted by Peter;
I raised/tilted up the front of my seat by adding 2 spacers approx 25mm, using longer modified
allen-head screws. This effectively gives more legroom but puts more seat
under your knees, something I wanted anyway. Depending on how much more leg-room
you need, this may be a first quick option.
In my situation I now need to move the steering wheel aft a bit, probably using a spacer
of sorts.
Nigel