Table schema:
CREATE TABLE table_name_65 (investing_dragon_s_ VARCHAR, first_aired VARCHAR, entrepreneur_s_ VARCHAR)

Question: Who were the Investing Dragons in the episode that first aired on 18 January 2005 with the entrepreneur Tracey Herrtage?
SQL: SELECT investing_dragon_s_ FROM table_name_65 WHERE first_aired = "18 january 2005" AND entrepreneur_s_ = "tracey herrtage"