On Sat, 04 Sep 2004 00:06:08 +0100, Andy Hall
wrote:

Compressing metal cavity fixings (aka Hollow Wall Anchor on Screwfix
site) are the best choice for this.

Two layers of tiles and a layer of plasterboard are way beyond what
hollowalls will manage. You need to try to get into the backing
studs or use a fixing which will cope with such depth. Something
like the Fischer plasterboard plugs which are very tolerant of
substrate depth will be much better.


--
Peter Parry.
http://www.wpp.ltd.uk/