RE: pronunciation of Daventry - I live in Northampton, and having only ever heard it said as it's spelled, I did make a point of asking a few born-and-bred types if that was the way it had always been... Could find no-one who remembered anyone ever saying 'Danetree' - but I admit not exhaustive research - does anyone have a counter-case?

...now Northamptonshire, that I've heard mispronounced a time or three...