No need to explain it OG, I got it :thumb: but thanks anyway. Time is the main reason for pre tiling. By the time its delivered and sorted out, had its inspection from the pool tiler, been waterproofed and then tiled it will be Xmas. I have to build a deck around it etc..... well before then and having it all done in a covered factory in a controlled environment makes sense to me. As soon as it arrives I can crack on with the deck without having to worry about a tiler pissing and moaning and getting in my way and visa versa. I think over 3.5 mt using 25 mm mosaics it would have to a full tile out to be noticeable, which would be a massive fuck up on their part and virtually impossible to do as they will be following a perfectly level top edge of the pool. It should all come down to the crane placing it gently straight down ( hopefully)