Some more info on Brig's affluence level and social makeup would be welcome, thanks!
If you still need this (sorry for the late reply!).....Bamber Bridge (or as you are quite rightly directed to call it, Brig) is a fairly suburban little town/large village. Good mix of the "hard working families" working locally in below average pay offices and shops and the like, and commuter country working in Preston or Blackburn, maybe even further away, and then there's a good slice of new build estates springing up with the young professionals that flock to such places. There's no obvious pockets of poverty, it's very much "comfortable".
The ward with a byelection is an odd one - a good slice of it is an industrial estate (where I worked for nearly 2 years).
Here are some streets within Bamber Bridge East :