Where is this?

I left a clue in the source of the image -

https://www.mylondon.news/news/nostalgia/tiny-mice-statue-london-wall-18406831

I read it in a little book and even once I knew about it, I found it rather difficult to find. It's between Monument and Fenchurch Street station. I did feel quite smug knowing that it was there when those around me almost certainly didn't 😆

I think it was this book I found it in - although I don't remember it being so expensive!