Context: CREATE TABLE table_19529639_3 (second_national_tour_year_2 VARCHAR, original_west_end_cast VARCHAR)
Question: How many different actors from the Second national tour year 2 played the character played by Oliver Tompsett from the original West End cast?
Answer: SELECT COUNT(second_national_tour_year_2) FROM table_19529639_3 WHERE original_west_end_cast = "Oliver Tompsett"