As written elsewhere:

"How do you remove the seat?  The first thing you do is buy a manual...

Then you bend way way WAY OVER, and look under the edge of the seat and find the 2 bolts you need to remove."

I DO intend getting a manual (Clymer, I assume?), but in the meantime I'd be ever so humbly grateful to know WHICH 2 bolts? Those that go vertically upwards or those which go horizontally (into a bracket, I think).

Not sure if re-modelled (or at least re-covered) seat on mine is making location less obvious!

Step One in tank removal....

Derision accepted - I am NOT by any stretch of the definition a mechanic.

"Screw direction horizontal, pointed a little forward. "

That's the bit I needed! Thank you verslagen - 'tis off.