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Trouble is so often people have asked things that aren't quite what we want to know, therefore, we worded our questions to suit our particular circumstances and were hoping to get some help. Heigh ho......guess we just have to go trawling around....or ask somewhere else. :(
If you don't want to bother then i'd seal the wall with a watered down waterpoof pva - not so much to prevent water ingress but to make tiling a bit easier. Similarly on the floor. Personally I'd get the tray in first (bedded on a mortar mix or floor tile adhesive to help ensure total support, prevention of movement and to help get exactly level) for three reasons:
1/. less of a step into it (10-15mm does make a difference - ask my wife lol)
2/. less chance of cracking a tile which lies part way under it over a period of time
3/. since you may have to use mortar/adhesive to level it exactly, you may have an unparallel line between the bottom of the tray and the floor, which will be much harder to satisfactorily fill and less attractive.
I would finally advise that you don't use ready mixed tile adhesive for the wall tiles and instead get powdered stuff from a tiling shop which you can mix to your own preferred consistency (using a paint paddle and slowish drill(I use a battery drill)), is easier to wipe off / clean out joints as you go and less likely to get caked on your hands!
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