They do not send out any email, you have to call them and quote the reference number to check about when the certificate was dispatched.I'm waiting for my PCC as well. Submitted the form to them on 28 Oct, still haven't heard back.
Do they send out an email when the PCC is despatched?
Even I was waiting, they dispatched it on 30th Oct 2017 but still I did not receive. It was through normal postage without tracking, however I called them yesterday and paid them 250 pounds extra for another copy with the tracking number. As per their information, I will receive it within a week.