Woodmouse or a rat?

Woodmouse or a rat?

Observation - Woodmouse or a rat?. Description: I saw this on Hampstead Heath, north London, a few weeks ago. I just assumed it was a rat, but now I'm wondering if it's actually a woodmouse. (Based on the ears...?) Can anyone confirm either way? Many thanks!

I saw this on Hampstead Heath, north London, a few weeks ago. I just assumed it was a rat, but now I'm wondering if it's actually a woodmouse. (Based on the ears...?) Can anyone confirm either way? Many thanks!