best bet is looking on a UE site like http://www.28dayslater.co.uk/forums/
i had a quick squizz on there earlier... but then I saw this..
http://www.28dayslater.co.uk/forums/showthread.php?t=42565
and ran away crying for my mummy... seems they don't like strangers in those there parts... and I thought we were harsh on noobs asking questions! 
oh yeah they can be harsh, the problem is most of the locations are generally private property and require you to trespass, now IIRC the police can't do anything regarding trespass if you haven't damaged anything (then it becomes criminal damage), so on that forum they get a lot of randoms asking, how do i gain access, well the access point is generally a damaged fence or broken window.
best best is to just search for your area on the forum and see what pops up
sounds like an interesting shoot, and gives you an insight into scouting locations, good luck!