Strongly agree with Bev.
Outside Paris there is quite a strong "anti Parisien" feeling. You don't want to upset your new neighbours, the Marie, other tradesmen you might use, by not using a local professional.
Why English speaking ?????- if you are planning to live in France then you must start French sooner or later? The vocabulary of building/purchase may be technical, but it is not difficult...a good dictionary and google translate will help you!
Years ago when I arrived in rural Normandie I drove a UK reg car for some months. I asked my neighbours if there was any antagonism towards UK cars on the local roads. (big tractors, narrow lanes etc). "No problem" they said, but just don't drive a French 75 reg car!
DejW
You may find that it's a better idea to work with an architect or contractor in the area where you are considering buying. The local folks will probably have a better understanding of the local building codes and regulations. As far as English speaking is concerned, good luck. You could just try calling around - or even asking at the local mairie.
Cheers,
Bev