| call_naptan | Call the NaPTAN API for all, or for specified ATCO codes. Returns a data frame of Naptan data. | 
| call_naptan_region | Call the Naptan API for a partial or full region name. Returns a data frame of Naptan data. | 
| get_atco_codes | Return a vector of all permitted ATCO region codes in NaPTAN | 
| lookup_atco_codes | Return a lookup table of all permitted ATCO codes and area names for a specified area string and/or country |