Question: What date did the episode with a weekly ranking of 14 air?
SQL: SELECT "Airdate" FROM "2-12890652-4" WHERE "BBC One Weekly Ranking" = 14.0;

Question: What is the total number of total viewers with a share of 18.8% and a weekly ranking under 16?
SQL: SELECT COUNT("Total Viewers") FROM "2-12890652-4" WHERE "Share" = '18.8%' AND "BBC One Weekly Ranking" < 16.0;