I'm a sucker for the neatness of the square.

Two reasons to go bullnose, safer, you don't want to hit your head on a square edge paver and comfort, when you standing and sitting in the pool a square edge won't be as comfortable. We have just finished a project where they actually swapped square edge for bullnose after a child hit the edge and injured themselves.

annb1997 - Yes, that is part of the reason I'm doing this project. The entire area will be lowered, re-graded and some drains installed (the garden edge is kind of temporarily in place for now, got a great deal on the plants so they had to go in). It's a bigger job than anticipated as it also means the air conditioners (x3) need to be de-commossioned and re-installed at the new levels. John, I like the idea with regard to the tank, but we get allot of bitey critters and I don't really want to give them anymore areas to hide out in.

Thanks for that link Lee. Not sure how I will go getting tile out - I was rather hoping for some kind of 'elbow' profile that I could silicone over the top and create a neat frame. I would if I could grind a channel where the tiles meet and retro-fit that metal trim? 'Me me' and 'Gallifrey' have metal edge too - I did not know that was an option. I certainly would have suggested that. Note to oneself - research before you get in a mess - not afterwards!