Hi mate, welcome to the forum. You'll find lots of help here if your're looking to refurb your C5's or just talk about them. The forum is also a wonderful resource, and you learn something new every day!
If you're at a loose end some time, you should pop over to Portland and we could meet up for a pint and a run on our C5's! You'd be most welcome. I've not been lucky enough to meet anyone else with a C5 yet. In person I mean. Regretfully, many of the C5alive meetings and outings are held too far for me, so it's been something I've been unable to do as of yet.