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

### Instruction:
When was the first UK broadcast for the episode with an official TNS Gallup rating of 1575000?

### Inputs:
table_name: table, columns: ['Episode', 'First broadcast Denmark ( DR1 )', 'Official TNS Gallup ratings', 'First broadcast UK ( BBC Four )', 'Official BARB ratings']

### Response:
SELECT First broadcast UK ( BBC Four ) FROM table WHERE Official TNS Gallup ratings = 1575000