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TABLE: CREATE TABLE table_name_67 ( whenbuilt VARCHAR, name VARCHAR, builder VARCHAR, withdrawn VARCHAR )

### Question ###
What is the whenbuilt of the Brighton built Blandford Forum with a withdrawn of september 1964?

### Accurate SQL ###

SELECT whenbuilt FROM table_name_67 WHERE builder = "brighton" AND withdrawn = "september 1964" AND name = "blandford forum"