Recently there was long thread about the BCA. I can now post possible answers to some of the questions, such as "Why is the BCA still raising membership prices when there is a significant amount still left in its coffers?"
Apart from the obvious rainwater fittings, plastic road cones make good collectors - but you could to become a road cone nerd able to spot the "removable base and notch at the top to tie pipe to" models from 200m at 60mph.