Question: Who was the second couple for the episode having an ITV1 ranking of 29?
SQL: SELECT "Second couple" FROM "1-25664518-3" WHERE "ITV1 weekly ranking" = 29.0;

Question: What is the maximum ITV1 weekly ranking?
SQL: SELECT MAX("ITV1 weekly ranking") FROM "1-25664518-3";

Question: What was the number of viewers for the episode having a fourth couple of Tony and Jamie?
SQL: SELECT "Viewers (millions)" FROM "1-25664518-3" WHERE "Fourth couple" = 'Tony and Jamie';

Question: Who was the first couple in the episode having a fourth couple of Sammy and Nat?
SQL: SELECT "First couple" FROM "1-25664518-3" WHERE "Fourth couple" = 'Sammy and Nat';

Question: What is the minimum ITV1 ranking for the episode having viewership of 5.42 million?
SQL: SELECT MIN("ITV1 weekly ranking") FROM "1-25664518-3" WHERE "Viewers (millions)" = '5.42';