What is the date of the election where Sir Christopher William Codrington is elected First Member and the second party is Conservative?
CREATE TABLE "members_of_parliament" (
  "election" text,
  "1st_member" text,
  "1st_party" text,
  "2nd_member" text,
  "2nd_party" text
);
SELECT "election" FROM "members_of_parliament" WHERE "1st_member"='sir christopher william codrington' AND "2nd_party"='conservative';