Gentlemen,

I slightly exaggerate, but not by much.
I have to hang a rad to that lino-esque stuff you find more and more used
in bathrooms these days. I *think* it's called panelboard. Anyway, it's
about 12mm thick ply with a waterproof decorative veneer on top; comes in
large sheets you just stick to the walls with qik-grab-goo IIRC.
Anyway, where I have to fix this rad, there's no actual wall of any
description behind the mounting points, so this panelling will have to
bear the weight by itself. Fortunately this isn't a big or heavy rad
(only around 20lb I would guess).
What sort of fixings would be best to use for this job?

cheers,
cd.