Returns latitude and longitude for the given easting and northing.

Takes an OSGB36 easting and northing (British National Grid) and returns the geographically equivalent WGS84 latitude and longitude.

A successful request returns the following fields:

• status - this will be ok
• easting - the easting provided in the request
• northing - the northing provided in the request
• latitude - the latitude of the converted coordinates
• longitude - the longitude of the converted coordinates

An unsuccessful request returns the following fields:

• status - this will be error
• error - an error message

{
  "error": "Both <easting> and <northing> must be provided, must be positive integers, and must be within range.",
  "easting": 326897,
  "northing": 673919,
  "latitude": 55.95271,
  "longitude": -3.17227
}