Question: What is the Official ITV1 rating for Auditions 4?
SQL: SELECT "Official ITV1 rating" FROM "2-17809257-14" WHERE "Episode" = 'Auditions 4';

Question: What is the lowest official ITV1 rating with 45.4% share?
SQL: SELECT MIN("Official ITV1 rating") FROM "2-17809257-14" WHERE "Share" = '45.4%';