When was the first UK broadcast for the episode with an official TNS Gallup rating of 1575000?
CREATE TABLE table_26591309_2 (first_broadcast_uk___bbc_four__ VARCHAR, official_tns_gallup_ratings VARCHAR)
SELECT first_broadcast_uk___bbc_four__ FROM table_26591309_2 WHERE official_tns_gallup_ratings = 1575000
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_26591309_2 (first_broadcast_uk___bbc_four__ VARCHAR, official_tns_gallup_ratings VARCHAR) Question: When was the first UK broadcast for the episode with an official TNS Gallup rating of 1575000? [/INST] SELECT first_broadcast_uk___bbc_four__ FROM table_26591309_2 WHERE official_tns_gallup_ratings = 1575000 </s>