Wood mouse

Wood mice are regular visitors to the food I put out for the hedgehogs, but they're usually off like a shot if I go outside.  However, tonight when I opened the hedgehog house lid, there was a tiny mouse, and it didn't run away. I dashed inside for a camera, and managed to capture this shot before it ran off.  From the photos recorded by the cctv camera in the box, this is much smaller than the usual mouse, probably a young one.