Freshly laid spawn is much firmer than when it has been in the water for a few days. It sits proud of the surface, before slowly sinking as water is absorbed through the cell walls.
In this early stage it is quite vulnerable to frost damage and we have a couple of very cold nights(by Southern England standards) forecast. I may take a very small quantity of the spawn and raise it in an aquarium in a sheltered part of the garden. The tadpoles can be released back into the pond later on, but I may be able to prevent all being killed by frost. And it will be fun to watch it develop, because I am still big kid when it comes to things like this!