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

### Instruction:
What was the airdate of the episode with a UK viewership of 6.02 million?

### Inputs:
table_name: table, columns: ['No. overall', 'No. for series', 'Title', 'Directed by', 'Written by', 'Original air date', 'UK viewers (million)']

### Response:
SELECT Original air date FROM table WHERE UK viewers (million) = 6.02