YEs, you send to their published email address. You also CC yourself.
Why do you want to wait until day 30 to respond? If you are simply looking to delay everything, then you respond on day 30 and add to the response that you are seeking debt advice and they are required to give you at leat another 30 days to receive that advice.
However, there is no reason to delay that I can think of. Even if they do issue a claim, you are talking at least 6+ months before any conclusion.