I think Taylor Buildings must be the three blocks of properties on Cromwell Street opposite Oliver Place, occupying the site of Derek's childhood playground. These aren't named on the 1875 OS map, but the large-scale version shows that the blocks were double-fronted (i.e. they were back-to-back properties) and each property had what appears to be a flight of steps up to a front door and another going down to a cellar, typical of early 19th century multiple-occupancy dwellings. This would mean there were probably 30 two-storey houses above ground, possibly originally with 30 cellar-dwellings underneath, which would easily account for Bert's police inspector living in no. 24.

Attached Images
Cromwell Street 1875.jpg (128.04 KB, 43 downloads)