After all this time, we finally went down to the area beyond the little 17th century/medieval street in the above photo, but - and here's the drawback - the part of it which I most wanted to see was temporarily blocked off by scaffold, so we will have to make a return trip soon to go down into the darkness and look at the old front doors which lie behind the door at the end of this lane...
To recap, this is probably the last medieval street left intact in Bath, and it runs along the line of the city wall (long since demolished) to the right of this alley. It has various names - 'Ducking-Stool Lane' being my favourite, since the lane and wall terminated at the river, about 200 feet the other side of that little door.
So... the unedited video below (taken on a crap camera by a crap operator) is a glimpse of everything else above it, which includes the first floor of the exterior street-wall (you can see the windows) and all the late Victorian building above it, currently undergoing restoration.
At one point, we are looking down onto the lane, now sandwiched tightly both sides with Georgian, 17th century, Victorian and modern building. This lane lead to the North Gate, long since demolished, and was the main route into Bath from the London direction.