The Governor of the HM Prison, Oxford, appears to be a kindhearted fellow at the start as he arranges for an O-level exam for a prisoner renowned for his ability to escape. He was, though, quite sceptical of Evans and made every arrangement to make sure that Evans had no means to escape.
He was also very proud and self-conscious. He did not want Evans to disgrace him by escaping from his prison. He had a sharp presence of mind, which was clear from the fact that he cross checked every call that was made to the prison that day.
However, he got over-confident of his arrangements and gave Evans the opportunity to escape.
Also, he was a person who did not mind showering praise on a prisoner. When Evans revealed his secret plan to him, he admired him. At last, he proved to be just another gullible Governor when Evans tricked him again and successfully escaped. His overconfidence and self-praise let him down.