text: I don't think there's data on those, mainly because the limits are pretty arbitrary, unofficial, and open to interpretation. The only thing that's definite is local suburban centres, eg Pudsey with its town hall, so they are represented as points on the map rather than boundary relations.
  
  However, there *are* electoral ward boundaries, which I don't think anyone's mapped.
  
  Not sure if this is a help for you.