Is the side which doesn't have the Seltzman machine looking for Seltzman? The Village want the reversal process, and probably want to keep Seltzman safe in the Village so to protect him. Thereby stopping another side from acquiring a Seltzman machine, that would be the British would it? Well it would have to be, wouldn't it. After all the Colonel has been seconded to the Village for special duties, and he isn't the first. I cannot believe that every Colonel who has found himself seconded to the Village is a traitor. So when working for the Village, the Colonel continues to work for the British. So why the need for the Undertaker to follow the Prisoner as well as Potter? Perhaps they sent Potter to follow the Prisoner, and the Undertaker to follow Potter, as insurance perhaps.
Be seeing you