When the others had a value of 7%, what was the Polling organisation/client?
CREATE TABLE "opinion_polls" (
  "date_s_conducted" text,
  "polling_organisation_client" text,
  "conservatives" text,
  "labour" text,
  "liberal_democrats" text,
  "others" text
);
SELECT "polling_organisation_client" FROM "opinion_polls" WHERE "others"='7%';