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

### Instruction:
What is ISBN UK, when Author is "Dave Martin", and when ISBN US is "N/A"?

### Inputs:
table_name: table, columns: ['Title', 'Author', 'ISBN UK', 'ISBN US', 'TV companions featured']

### Response:
SELECT ISBN UK FROM table WHERE Author = dave martin AND ISBN US = n/a