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

### Instruction:
What is the title of the episode that aired on 13 august 1981?

### Inputs:
table_name: table, columns: ['Episode #', 'Original Air Date (UK)', 'Episode Title', 'Director', 'Writer', 'Cast']

### Response:
SELECT Episode Title FROM table WHERE Original Air Date (UK) = 13 August 1981