Wow, thanks for all the extra info guys!
I'm afraid I didn't get through the gym quickly enough to go out to the barge before work today - on the upside, I managed unassisted pull-ups for the first time ever, so I'm pretty happy. I'll make the next one, it would be great to meet people!
I have already gone between two buses, and have decided it is something I am going to avoid in the future. I didn't get hurt or anything but it was a bit scary.
Definitely going to look into some of the organized rides, thanks!
The helmet mirror looks wonderfully dorky. I think I may need one. Definitely have to sort out my lights and panniers or a basket. Other than that my budget for this is shot for the moment (after bike, lock, helmet and jacket).
@Darkerside - I was pedalling around the meadows singing "Summertime" to myself yesterday afternoon, it was lovely. :D