In the novel A Pocket Full of Rye, 14 Rushmoor Road is an address in the Muswell Hill area in north London. Irene Grosvenor, the personal secretary of the late Rex Fortescue, lives there. This address is only referenced once when Inspector Neele asks Miss Grosvenor for her full name and address when interviewing her shortly after Forstecue dies.
There is no actual Rushmoor Road in the Muswell Hill area.