If you've ever been lucky enough to see one of these engaging little creatures this blog may be of interest to you. I used to find lots of Dormice summer nests in some of the woods in Hampshire. I was told by some of the people from Southampton Uni that Dormice are a good indicator of a healthy woodland.
http://www.swog.org.uk/articles/dormice-monitoring/
Here's a link to the People's Trust for Endangered Species if you you'd like to add to their surveys LINK