Thanks for those thoughts.
Sorry - didn't get anything better on the barge - all very hemmed-in there, and there are several with hose big round windows. I've taken a walk with Google Streetview on that side of the canal, but nothing matches.

Had assumed that was previously a sliding door.

I would also guess that she is a former inland tug, now an houseboat. The wheelhouse door seems to be a sliding window. Do you know the name of the background boat which looks like another houseboat conversion from an inland barge (péniche)?