Who is the guest 1 in the episode where guest 4 is Jill Douglas?
CREATE TABLE "season_2006_07" (
  "date" text,
  "presenter" text,
  "guest_1" text,
  "guest_2" text,
  "guest_3" text,
  "guest_4" text
);
SELECT "guest_1" FROM "season_2006_07" WHERE "guest_4"='Jill Douglas';