House on Right move, typical Victorian end terrace, originally with 3 beds and a downstairs bathroom. Usually the 3rd (back) bedroom will be converted into a upstairs bathroom.
So, obviously wanting the best of both worlds, someone has put in a bathroom in part of the bedroom, thus gaining a bathroom and keeping the 3rd bedroom. A bedroom that measures 4ft 2 by 10ft 1.
Apparently there is no minimum size for a bedroom.