I'm seeing quite a few of these in a patch of garden where there is good cover from bits of wood, overgrown plants etc:
I'm not great at identifying small mammals, but the reddish coat and fairly long tail (not visible in these pics) suggests bank vole to me. Have I got this right?

(Or is it a field vole!)
I'm hoping for a brighter day because I'd love to try to get some decent photos. Couldn't get shutter speed high enough today to prevent motion blur on most shots.