Well it felt like winter this morning Alan.
I ended up with a hat and gloves on, but it has warmed up a bit now.
The pond is much better. I did 2 very partial water changes only about 10 inches each time as the shallow end always empties first and the frog spawn had been laid there and I didn't know if it survived out of water for long so didn't like to take the risk.
What was a lovely surprize though was as the water went down, although only 3 clumps of spawn was visable above water there was absolutely loads hidden in the shallows. I can breathe easy again..
The fish seemed to like the cleaner water and came looking for tasty goodies to eat amongst the spawn.
Maybe the frogs should have laid it a bit nearer the edge.
So all in all things have improved. It is not completely clear but is definitely an improvement. I am just hoping that the UV does the rest.