Below is an instruction that describes a task. Write a response that appropriately completes the request.

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What is the whenbuilt of the Brighton built Blandford Forum with a withdrawn of september 1964?

### Inputs:
table_name: table, columns: ['BRNo.', 'Name', 'Builder', 'Whenbuilt', 'Withdrawn']

### Response:
SELECT Whenbuilt FROM table WHERE Builder = brighton AND Withdrawn = september 1964 AND Name = blandford forum