Roman Baths South of the Thames

[Medicus matt]

If it was outside the boundaries of the city, could it have been private, like part of a villa? It looks pretty big, though. Do we have any idea when settlements to the south of the river reached a stage where a public bath house would be viable?

Although outside of the walls of Londinium, the area around the bridge on the south bank was already well developed by the end of the 1st century AD.
Large-scale non-industrial/commercial development resulting in the clearing of 1st century structures was well under way by the early/mid 2nd century.