What is the UK broadcast date of the episode where Chris Bonington was the presenter?
CREATE TABLE "series_3_1996" (
  "episode_no" text,
  "episode_title" text,
  "uk_broadcast_date" text,
  "presenter" text,
  "countries_visited" text
);
SELECT "uk_broadcast_date" FROM "series_3_1996" WHERE "presenter"='chris bonington';