mtbrog and 100mphplus – it sounds like you had the same issue as me, I have been allocated a start time 2.5 hours earlier than my mates.
I contacted them via Eventbrite and then facebook, and got a response through both. They told me I had selected that I was elite, my mate who did our entries is certain this was not the case. It looks like there may be an error on their part if multiple people have had the same issue.
I was told to register at my allocated time, then wait and set off with my mates.