Thanks. That's what I suggested but, as I said (and despite BAS's comment), I can see no obvious screw in it - I guess just a photographic matter?As you look at the photo it is at the bottom right (to the right of the L terminal.) The photo is upside down.Where is the earth terminal on that switch? Is it that circular something at the side (on right, with the switch upside down) which has no obvious screw in it?
Kind Regards, John