Front seat removal

take the whole lot out, 2x plastic covers on the rear runners, take them off, 2x 13mm nuts at the front in the centre, then slide the whole seat off the runners, tilt up and disconnect the electric plugs for motors, airbag and heaters

really, from you 1st post i thought you were trying to split the seat from the subframe as there is only 2x bolts to undo at the front to slide the whole thing out, I've been breaking A3/S3 and mk4 golfs for a good few years now and have never struggled to remove a complete front seat. Should be once the rear plastic seat runner trims are off, 2x front 13mm nuts off and slide the whole thing back by lifting the lever that moves the seat on the rails.

yeah so you were trying to split the seat from the base, just for clarity

1. slide seat forward.
2. remove the seat runner trims (careful as i think at least one has a little cover over a screw head so dont just pull them or they will break) these trims are the ones that cover the runners that are welded to the car sill and tunnel and the plastic trims just cover the ends of the runners.
3. slide seat all the way back, in the middle of the seat on the cross member on the floorpan there are 2x 13mm nuts to undo, they are tricky to see unless you know they are there, both nuts are about 30-40mm apart from the centre line of the seat (facing the brake pedal almost)
4. slide the seat back again and it will come out of the back of the runners (hence why you need to remove the plastic trims or you would break them.
5. tilt seat base up to disconnect the plugs.

from start to finish - 3 minutes tops really.

hope it helps

no worries