The West Wilts Directory 1936, records among the entries for Portway, Warminster:
J. Day, chauffeur, Carter’s Lane.
J. Davis, butler, Carter’s Lane.
Carter’s Lane is listed in the directory between the house known as St. Augustine’s and the Nag’s Head Inn, Portway. [Which suggests that the start of Carter’s Lane became (in the 1960s) the modern day entrance road to the Portway Lane residential estate.