Thanks a huge amount for all the help and encouragement (especially diolma who I forgot to thank above).  Changing the pool surrounds really made a huge difference and I had a really good play with positioning the camera.  I think I've managed to produce the only real piece of "art" I've made as a result (As The Suns Set) which is up on my gallery.

It's really nice to find a bunch of people so willing to help.