Thank you all for your comments.
Funny how some days the light just doesn't work, but it worked nicely yesterday with an ever changing mix of sunshine & building clouds
This lagoon has previously give me trouble getting a satisfactory composition that wasn't too busy with reflections & trees, but yesterday I spent less time shooting and more time looking and thinking. Was only a short distance from someone's back fence in places so was hoping they would not think I was lurking suspiciously
But I finally found a few spots that worked nicely