Just a quick heads up for those waiting a while: do get in touch with the institute at which you had your interview! (That doesn't just mean a while from having had your interview, since the following all happened within 10 days of my interview, just from when the university first received your application!)
GTTR has a few set "timers" within its system. I can't remember them exactly, but I believe it is something like 56 days from said institute receiving your application to giving you a reply, and/or 28 days from said institute first telling you of an interview to receiving a reply.
If said university does not reply within the given time frame, GTTR automatically updates with "unsuccessful."
For me, the timer from Reading just so happened to coincide with when they were going to let me know if I had been successful or not. Being abroad at the time, I didn't have access to my post, just track. So, when I signed into track to find out that my application had been forward to the next institute, I was absolutely gutted. I thought my interview had gone great! Anyhow, 2 days later, my housemate (under instruction from me to open any post from Reading) informed me that I was successful and had a conditional offer!
So, I went back to track and dug a little deeper. On another screen it said "Reading: Unsuccessful - No decision received." I was shocked that they could do this.
Got back in touch with Reading, who apologised for the inconvenience and informed me that I had to ring track, tell them to withdraw my aplication from the new university and have them replace my 3rd university with Reading so it would get sent back there.
So, yeah, don't be afraid to be in touch with the universities! It can save some very unnecessary disappointment! (Reading PGCE Chemistry, here I come!...Subject to conditions :P)