I remember a while ago, more than 20 years now, a friend bought a canal boat from up country, quite a long one. I volunteered to help her bring it back down to moorings. We came through the Tardebigge flight, about 30 locks I think. We took turns at each lock cranking the handle and pushing the beams. We were fitter then. I also remember going through a very long tunnel on the same trip, (Kings Norton ??) completely black apart from the Lucas square eight light mounted on the front. She sat right at the front like some sort of figurehead and left me at the back doing the driving. I turned the light off a few times just for giggles, and to learn a few new words. We were so dark adapted, that when we came out, we had to park (collide) with the bank for 15 mins so we could see again to move on.
Andrew.