You'll most likely only have to complete enrolment, which is usually done online, so you'll be sent an email regarding that sometime soon. Aside from that, I don't believe there is much else to do. There isn't going to be anything scheduled for the 1st week of September so as far as I am aware you won't miss anything.
If you're concerned, give KCL a call, but apart from that I'd just make sure that on holiday you have access to WiFi so you can keep an eye on your emails.