I thought if the drain was slanted it wouldn't stand proud though and perhaps was slanted and tiled like that for dodging a joist which was mentioned in the earlier post. Hence me asking to be honest.Thats the only reason the tiles stand proud Dan because they are not going to the correct corners of the drain. Pretty sure that if the falls on the former had been adhered to, pardon the pun, then the 2mm lip would definitely not be there.