In message , Sacha
writes
This year we have no toad spawn in the pond but loads of frog spawn. This
is unusual for us and the opposite of all previous years. I have no idea
which frogs they are but some are pretty big - probably 8" long if stretched
out. They have stripey legs, cross banded stripes, rather than vertical and
silvery chests. To me their back feet seem very large but perhaps that's
just my ignorance. I wonder if anyone knows what we have and why we have so
many of them suddenly! Where have our toads gone, I wonder!

The cross banding on the legs would indicate the native Common frog,
Rana temporaria but 8" seems a bit large even for the (larger) females.
Other identifiers are dark patches behind the eyes and two slight ridges
running down either side of the back. Colouration can be very variable.

There are some larger introduced European species in England including
the Marsh frog which are becoming more common but from memory these
don't appear until April/May. The Marsh frog is an olive green and
somewhat larger than the Common frog but as far as I am aware it has not
yet reached the SW.
--
Robert