Good to hear of hedgehogs doing well in some areas, always loved those little buggers.
One of the best things you can do to help them out if you have a fenced yard is to knock a couple of small holes in the bottom of your fence and encourage neighbours to do the same, if they can travel through gardens easier it keeps them off the roads and opens up new territory. My ma got everyone on her close knocking holes out of their fences a couple years back after seeing it on Autumnwatch or something and she's always getting hedgehogs visting now when she never saw them before.