CREATE TABLE table_name_51 (semi_final_second_television_commentator VARCHAR(255), year_s_ VARCHAR(255), final_television_commentator VARCHAR(255), spokesperson VARCHAR(255))
Who is the semi-final second television commentator with graham norton as the final television commentator and scott mills as the spokesperson before 2013?
    
SQL: SELECT semi_final_second_television_commentator FROM table_name_51 WHERE final_television_commentator = "graham norton" AND spokesperson = "scott mills" AND year_s_ < 2013