Went to the self-help area, sat round, someone noticed me & listed to my query, typed in my student number on the terminal which popped up an Error Code 13. Sat in another row for lady at the "front desk" in the area to become available. Filled in a paper registration form, handed it in and 1 minute later the registration went through.
Didn't have anything better to do and, when they did help eventually, everything went smoothly.
Rather go now before the "exam written results released" hoards are there.