For any fellow Xmas runners who use Endomondo.com - you can now join the Couch to 5K Christmas challenge at endomondo.com/challenges/77...
You don't need to use the app - runs can be uploaded from garmin devices or just manually.
Susan XX
EDIT: I've added walking to the challenge now as well, so even if you're unable to run due to weather or over indulgence this will still add to the challenge.