What is the setting in the novel, The Cuckoo Sister?

This contemporary story takes place in areas of London. Kate Seton lives with her mother and lawyer father in prosperous Hampstead, enjoying a spacious yard and roomy home maintained by a housekeeper. The tidy household is shaken by the arrival of shabbily dressed Rosie from Hockley, "a rough part of London" an hour's journey away. Except for part of a day's visit by Kate and Rosie to Hockley—a noisy, cluttered place of heavy traffic, tall buildings, dirty alleys and shadowed doorways—the action unfolds primarily at the Seton home.