Here we go................
To remove the whole mirror from the car:
1. remove the rubber boot covering the little lever for altering the angle, just pull it off
2. unscrew the silver ring
3. the black plastic cover pulls off, its very tight though. I THINK the 2 clips are about an inch from the top and the corner nearest the front
4. undo the 3 screws and the whole unit will come off.
To remove the glass from the mirror:
The mirror glass is held on to its plastic base by an adhesive backing pad almost the same size as the mirror itself. I've just managed to remove it so its possible. You will need three wide chisels and a thin craft knife. Pull the longest side of the mirror level with the casing, you should just be able to see the plastic backing. Start by running the knife along the join a few times. Then put a chisel into the gap and GENTLY rock it sideways a few times (in line with the mirror not levering the mirror off), do the same at the ends. Rocking is more controllable than just pushing down. Any undue flexing of the mirror will of course break it. Continue to do this, cutting the backing wherever possible and use the chisels to gently force a gap for the knife. Took me about ten minutes. Eye protection and gloves needed
Another method could be to use a solvent on the adhesive pad to dissolve it, but not sure if this would damage casing/mirror if overused.
Yet another and perhaps more satisfying way would be to just smash the mirror!!!!