Triumph Repair: Spitfire seat frame removal, metric nuts and bolts, nuts and bolts

Question
I have a 1980 Spitfire that I am in the process of restoring (my first car to restore) and seems pretty straight forward but I am finding difficulty and need some assistance.
first, how do I pull the whole seat in cluding frame from the car.  I see four bolts underneath but wanted to check before attempting to turn.  Sencond, British cars of this era, do they use a special thread as my standard and metric seem just off sized a bit?  Is there a certain set of wrenches and sockets that I should be purchasing?
Thanks,
Mike

Answer
All bolts on the triumph were standard/sae, and not metric; some pipe fittings in the engine are BSP, and not tapered pipe fittings, but otherwise non-metric nuts and bolts are used.  Nearly everything is a fine thread, not a course thread.

The 4 bolts on the seat frame should be all you need to remove to remove the seat.