When the Prisoner was under surveillance in his London home, there was a camera behind the mirror. In the bathroom of his cottage in The Village, there’s a camera behind that mirror! Blimey, they really thoroughly copied his home, didn't they! What if all the other cameras were in the same places as in the London home, too? Now there’s a thought!
No 7 in The Village.....7 people attempted to escape in 'Checkmate.' There's that number again. It would seem there are more sevens in The Village than is dreamt!
If No.1 is supposed to be the alter-ego of No.6, the darker side to his nature, then I should think that No.1 knew the reason behind the Prisoner's resignation long before he was brought to the village. But having brought the Prisoner-No.6 to The Village, perhaps for darker motivations, so as to break his alter-ego in No.6. So as to stop his resigning from The Village in the first place.
Be seeing you