I have about 20 GCN in my Pond and last year was an absolute disaster for them.
I like you have Frogs and Toads in my garden but last year I had no successful spawn at all so no Tadpoles, no food for the Newts of Fish.
Looking forwards to a better year but so far no Frogs or Toads have appeared.
Last 2 years no tadpoles so newts ate baby newts. No toads in my garden, GCN's on a downward slide, smooth and palmate newts doing well, despite predation by GCN's, no fish except 1 weather loach. I used to use my "excess" GCN tadpoles to stock local ponds, probably illegal, but my garden and pond can only support so many, three of those ponds have now disappeared, filled in by builders rubble or turned in to a rockery by new owners.