code: def address(self, num):
          
          url_root = "company/{}/registered-office-address"
          baseuri = self._BASE_URI + url_root.format(num)
          res = self.session.get(baseuri)
          self.handle_http_error(res)
          return res
docs: Search for company addresses by company number.
  
          Args:
            num (str): Company number to search on.