What is the second party where the first party is Tory and the year is 1820?
CREATE TABLE "m_ps_1707_1868" (
  "year" real,
  "first_member" text,
  "first_party" text,
  "second_member" text,
  "second_party" text
);
SELECT "second_party" FROM "m_ps_1707_1868" WHERE "first_party"='tory' AND "year"=1820;