/**
  * get the lat/lon from a postcode
  *
  * @param string $postcode 
  * @return false/object
  * @author Andy Bennett
  */
 public function latlon_from_postcode($id = NULL, $postcode)
 {
     $postcode = latlon::clean_postcode($postcode);
     $this->where(array("postcode" => $postcode));
     return parent::find($id);
 }