You're not being dim at all, it's complicated, I was confused too, that's why I thought I should clarify where Court 29 was in 1891. The courts marked in red were the numbers used prior to renumbering the street which must have happened before 1889 (the map date).
Originally the house numbers were sequential starting on the north side of Brearley Street at Newtown Row, the court numbers were also sequential.
They then changed and used odd numbers on the north side and even numbers on the south side, they also changed the court numbering to match i.e. 1, 3, 5 etc. north side and 2, 4, 6 etc. south side.
I don't know if you've used this website for maps, it's very useful but a bit difficult to get to grips with.