This week i went there for an early appointment, lady at the front just said join the queue, so a waste of time, i still got queue no.5 but just lucky it wasn't busy.
Strangely i checked last week went in the afternoon and asked at the desk what to do as i have appointment next week, he said come to front of info desk and will get a ticket so it seems different staff do different things.
So it's hit and miss, system can't be relied upon