While more than the first year, numbers participating in Bike the Borough aren't yet huge - the maximum in our group was about 20 at any time, so I'd reckon maybe two or three hundred people did all or part of the route.
It's a delight to discover parts of Lambeth you've never seen before. I found two blue plaques I hadn't seen before and as I headed for home from Archbishops Park I passed a railway arch lock up and noticed this submersible used in the filming of BBC's The Deep (2010):
