How to tighten up the driver's seat.

It has a rattle that is getting worse..now even when i reach out my foot to press the clutch pedal i hear a click. Are there any bolts i could tighten?
 
Four torx bolts that fix the rails to the chassis and 6 nuts that hold the subframe to the rails ( 3 each side ) You will need a spanner for one side as the slope of the seat base means a ratchet can't fit.

I have Recaro's so it may be different for standard seats.