Bracknell is lovely
Suggest you wander around the High St or Princes Square after dark and see what you think. Why do you imagine that Oracle, SeeBeyond, Met Office, etc, etc choose to move out??? Come back in 10 years if the refurb gets off the ground. Now you could look at Ascot, Sunninghill, Virginia Water, but then your 350k won't go far
There is a never fail check for the quality of medium size English towns and it goes like this - check out the restaurants in the middle of town...
* Premier League - several high quality chains like Est Est Est or maybe even a Conran-a-like gastro pub
* 1st Division - Ask, Cafe Rouge, etc
* 2nd Division - Pizza Express, Cafe Nero, etc
* Ryman's Premier - Pizza Hut
* Sunday Pub League - McDonalds
...guess what you'll find in Bracknell