What is the lowest episode number with an original airdate on 8 June 2008?
CREATE TABLE "series_1_2008_ratings" (
  "episode" real,
  "original_airdate" text,
  "timeslot_approx" text,
  "viewers_millions" real,
  "nightly_rank" text
);
SELECT MIN("episode") FROM "series_1_2008_ratings" WHERE "original_airdate"='8 june 2008';