Anyone any experience of Good Gym? Have been looking at their site and it looks like there is one that goes regularly from East Finchley which I could probably get to on the way home from work. Most of their runs look doable by a C25k graduate - 2 - 3k each way. Might give it a go.
Bit disappointed to see that their advice for beginner runners (you need to be able to run for 15 minutes without stopping) doesn't include a link to C25K for people who can't.