The Doctor Who RPG by FASA Corporation was the first RPG I ever owned or played. As such it has a special place in my heart, even if the rules system was a little clunky.
I've reproduced the Interaction Matrix, with the rules for automatic success and failure figured into the table. For a refresher, anything below a 2 is automatic failure, and anything below -3 is automatic critical failure. Likewise, anything over 11 is automatic success, and anything over 17 is automatic critical success.