To remove the Seat Back you will need a 16mm ratchet & socket.
And a 6mm Allen Key.
There are 2 bolts on the Left and Right side.
And one Allen bold in the center that retains a keep plate (this slides out once the Allen bolt is removed).
The seat backs can now be remove (they are surprisingly heavy) but they do separate in the middle (a shaft connects them together)

The Seat Bench requires just the 16mm ratchet & socket.
Take the boot mat out.
2 bolts forward of the bench and 2 bolts in the boot and 1 bolt at the center Seat Back Support.
And the bench is out, it is very simple and probably doesn't merit a guide.
All you will find under the bench seat is the access panel for the electric fuel pump.