"Sounded like a click, something in the mirror?"
So what did the Prisoner do after he'd heard the click in the mirror? Did he just sit there, or did he, like John Drake here, take the mirror off the wall and see what was behind it? Whatever the Prisoner did, he knew that he was under close surveillance, that 'they' were watching him, whoever 'they' were, his own side, or those of the Village. But why? We like to think that the Prisoner resigned for good reasons. We don't like to think ill of him. But he's human, with human frailties. He wasn't going to sell out, he was going on holiday that much is clear. But he would eventually go the way as Chambers, and find himself in the Village.
Be seeing you