Look who I found trundling around my back garden at 8pm this evening:

It's not a great photo, but I didn't want to frighten the little chap too much and the light was already getting dim enough to need flash. I don't think it's the same one I saw at seven o'clock the other morning, marching determinedly across the lawn with a big bundle of grass in its mouth (presumably a female building a nest?), as it was huge and this fellow was only about average-sized.
Anyway, thanks to the bantam ladies for alerting me to his presence - they don't like unfamiliar creatures in their territory, but at least hedgehogs are safe from attack (unlike mice)!