Having seen the colossus and the tiny in the last week or so, we’re now moored close to the shallowest lock on the Grand Union canal. Fenny Lock only rises by 12 inches. It is also unusual because the road to the lock keepers cottage opposite goes straight through the lock so there’s a swing bridge to negotiate as well. As Eric quite rightly pointed out, the swing bridge is probably also used for the lock keeper to get across to the local pub, and back, safely
Coincidentally the lock keepers cottage is for sale if you fancy canal life but a narrowboat is just a bit too narrow.