docs: def text_uk_extremes(self, request):
          """
          Return textual data of UK extremes.
          
          request:
              metoffer.CAPABILITIES            Returns available extreme date
                                               and issue time
              metoffer.LATEST                  Returns data of latest extremes
                                               for all regions
          """
          return json.loads(self._query(TEXT, OBSERVATIONS, UK_EXTREMES, request, "").decode(errors="replace"))