code: public function lookupPostcodeMetadata( $postcode ){
  
          $path = sprintf( self::PATH_LOOKUP_METADATA, $postcode );
  
          $response = $this->httpGet( $path );
  
          return Response\PostcodeInfo::buildFromResponse( $response );
  
      }
docs: Returns metadata associated with a postcode.
  
  @param $postcode
  @return Response\PostcodeInfo