Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_73673 ( "Season" real, "Series" text, "Team" text, "Races" real, "Wins" real, "Poles" real, "F/Laps" real, "Podiums" real, "Points" real, "Position" text )

### Question ###
How many podiums when he was in the british f3 national class series?

### Accurate SQL ###

SELECT COUNT("Podiums") FROM table_73673 WHERE "Series" = 'British F3 National Class'