On Friday, August 21, 2015 at 10:27:02 AM UTC+1, Stephen wrote:
I have a shower curtain pole to put up in the bathroom

I have hollow stud partition walls with 12.5mm thick aquapanel
plasterboard which is then tiled over with 10mm thick tiles on a bed of
tile adhesive.

So we are looking at 25mm - 26mm thick "wall" before getting through to
the cavity.

Given that this shower curtain is going to get dragged open and shut all
the time, I don't want the wall fixings working loose.

Can anyone recommend a good quality STRONG cavity wall fixing that will
accommodate the thickness of the tile as well as the thickness of the
aquapanel that will hold up the shower curtain rail?

Wing type cavity fittings are out as I don't have a ceramic drill of
sufficient diameter to make a hole large enough to push the wings
through like these he http://www.toolstation.com/shop/p27061 plus
covering up the excessively large hole with the shower curtain rail is
going to be impossible as its of this type of shower curtain:

http://www.victorianplumbing.co.uk/S...%20slenderline

Is it a straight pole ? If you can you fix the pole by its ends, so there is no leverage force or pull-out force, the fixings will not need to be particularly strong (unless someone will be hanging on it).

There's not a lot of force exerted by shower curtains, which is why those spring loaded poles are often sufficient, but obviously a fixing should be as strong as possible.

I'm not sure of the nature of Aquapanel, but you might find drilling a pilot hole and screwing straight into it is strong enough - use a coarse thread screw. I have a generic cement board as my stud wall, and the shower pole fixing is screwed in like that.
Better still, screw into a stud if you are lucky and there is one in the right place !

Simon.