Campden Hill is a resedintial area where the narrator of Romance of a Shop wrote the novel, and where the Lorimer sisters’ house was at the beginning of the novel.
“There stood on Campden Hill a large, dun-coloured house, enclosed by a walled-in garden of several acres in extent.” (Chapter 1).
“She contemplated the familiar London pageant with an interest that had something of passion in it; and, for her part, was never inclined to quarrel with the fate which had transported her from the comparative tameness of Campden Hill to regions where the pulses of the great city could be felt distinctly as they beat and throbbed.” (Chapter 4)
Joshua Hanson was the one to originally develope the land into what was known as the Campden Hill Square area. He submitted the plans to build the square, originally called Notting Hill Square in 1826. Campden Hill was designed with several homes inside the square with a garden in the middle.
https://www.british-history.ac.uk/survey-london/vol37/pp87-100
IMAGE: https://hawksites.newpaltz.edu/virtuallylondon/2015/12/07/campden-hill/