Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_67 (whenbuilt VARCHAR, name VARCHAR, builder VARCHAR, withdrawn VARCHAR)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What is the whenbuilt of the Brighton built Blandford Forum with a withdrawn of september 1964?
### Answer:
SELECT whenbuilt FROM table_name_67 WHERE builder = "brighton" AND withdrawn = "september 1964" AND name = "blandford forum"