For info, the bath is a whirlpool bath so there is a greater possibility of servicing being required than perhaps on a normal bath.
We have built a timber frame all around the bath so there is effectively a 100mm shelf all the way around the bath. This too will be covered in ply & tiles. The timber frame has then been pushed into a corner and then the bath has been plumbed in/out. Obviously we can screw into the timber frame and then cap the screws but is there are more aesthetically pleasing method incorporating some kind of hidden fixings that we might be able to use? If anyone canot make sense of my description, page 21 of the current Topps Tiles catalogue shows a similar effect to the one we are trying to achieve.