Question: What were the air-dates of the episodes before episode 4 that had a BBC One weekly ranking of 6?
SQL: SELECT "Airdate" FROM "2-12890652-3" WHERE "Episode No." < 4.0 AND "BBC One Weekly Ranking" = 6.0;

Question: What was the total viewership for BBC One weekly rankings larger than 7, before episode 4?
SQL: SELECT "Total Viewers" FROM "2-12890652-3" WHERE "BBC One Weekly Ranking" > 7.0 AND "Episode No." < 4.0;