How many viewers in the UK did episode 50 have?
CREATE TABLE "series_1_2011" (
  "episode_no" real,
  "us_airdate" text,
  "us_total_viewers" text,
  "uk_airdate" text,
  "uk_total_viewers" text
);
SELECT "uk_total_viewers" FROM "series_1_2011" WHERE "episode_no"=50;