It was suggested by a good friend, that Number 36 isn’t Martha, but Number 36’s twin. Well they say we all have a doppelganger somewhere in the world. Then on the other hand, perhaps Number 36 was taken from The Village to London in order to enact the role of Mrs. Butterworth's housemaid. Then when the London episode of ‘Many Happy Returns’ was completed, Martha-Number 36 was returned to The Village.
Be seeing you