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 "2-12617978-5" WHERE "First aired" = '18 January 2005' AND "Entrepreneur(s)" = 'Tracey Herrtage';

Question: What is the average money requested in the episode first aired on 18 January 2005 by the company/product name IV Cam
SQL: SELECT AVG("Money requested (£)") FROM "2-12617978-5" WHERE "First aired" = '18 January 2005' AND "Company or product name" = 'IV Cam';