The Grand Union Canal
An overview shot of some narrowboats waiting for a lock to fill on the Grand Union Canal. There are over 1700 miles of canals in the UK. You work the locks yourselves, live on the boat, pilot from the rear with a tiller (and in the rain and wind). Top speed is 4 mph. The boat on the right is owned by a British family (you can tell by the sweaters and shorts).
I missed the definition of the "lexicon challenge" but "Narrowboat" (single word) is a relatively new word specifically for the boats plying the British canals.