UCAS held workshops in Coal Hill Academy at three times:
Posters for these UCAS workshops were hanging all over the school. (TV: For Tonight We Might Die)
At some point during an adventure, the Eighth Doctor had to use Quantum-locking to reboot the servers so the Web of Time would be maintained. (COMIC: The Grey Knights of Thyme)
UCAS still existed in the far future. (COMIC: The Eye of Torment)