I can only cite the people who refer to Oondull or Owndull - not being from those parts I hear both and cannot but be confused as to correctness. But at least I have a history of listening to those peeps. A stranger in town has no history of learning the ideosynchrasies.

How would you pronounce Cogenhoe? Wiki seems to have it right.
and does Rushden really have a "z" in it? Or two?

At least Norfolk don't haf any of yer Emmets.