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

### Instruction:
When david o'doherty and katherine parkinson are both on the davids team when is the first broadcast?

### Inputs:
table_name: table, columns: ['Episode', 'First broadcast', 'Davids team', 'Lees team', 'Scores']

### Response:
SELECT First broadcast FROM table WHERE Davids team = David O'Doherty and Katherine Parkinson