Frog for lunch?

OUR garden is small and sits in a row of gardens behind our terrace house, surrounded by other terraces.

In our small garden is a small 5x5ft pond.

Our pond does, though, support a pretty strong frog population.

On Saturday, when we returned home and I looked out of our upstairs window, this is what I saw on our neighbour's half built shed:

The question now is - do we have any frogs left?

I was amazed that in such an urban area as Bath a bird like this would contemplate a visit - I love my frogs, but I almost love the thought of a heron in our garden even more!