Dave,I took off the bottom row of wall tiles and the floor tiles around the tray and used mapei tape and gum from screwfix, tuff recommend them for use with their trays.Thanks whitebeam, I'll take a look at that.
Just bumping some of the older popular (sometimes not so popular) threads. Probably wont be current discussion these days but I just need to do it. So just ignore the thread if it's not current for you.