Well I think its pritty hilarious that people are justifying there statements by saying "Real zombies dont run" and such, to my knowledge there arent any real zombies, its just based on voodoo folklore which is based on the symptoms of TTX poisoning from were bokors would put tetrodotoxin and datura in peoples wounds in hopes that it would cure them.
Anyways back to the real topic, I would be more afriad of runner zombies, Ive never been afraid of shamblers, they wouldnt be much of a threat unless one was in my house (Which is pritty small and narrow) otherwise they wouldnt be that much of a threat, I'd still be afraid of them and woudnt wish to be chased by them in real life, but like I said there not much of a threat, if one got too close a simple push kick would drop them on the floor. Its hard to get hold of a gun in Britain but I have a nice longsword sitting on my wall, I even own a few sharpening stones (though there for my Hatchet and I havent used them on my sword, its probably illegal to do so) so I'd just hack off some heads while making my way to some were like Meadowhall were I'd bunker down, then again if it was shamblers and it was spread via biting and such, then I'm pritty sure the millitary would have it taken care of pritty quickly.
However runner zombies, well thats a different ball game, you carnt just side step them, they chase you, they'd probably hunt in packs too so my Martial Arts or sword wouldnt help much, with shamblers even though they hunt in groups too I'd be able to take shots with the sword or throw puch kicks and keep pulling back, but with the fast one's well I wouldnt have time, they'd simply rush me. There usually alot more clever then shamblers too so I imagine they'd be able to climb so just getting to a high spot might not work as well. Again though, I would just make my way to Meadowhall with my family and other survivors and bunk up there. I doubt the place would be overrun before we got there, maybe some one might have cleared it before we get there lol. But that would be the safest place, find all entrances, lock them seal them with what we can, then baricade it, find as many weapons as we can, some improvised, and wait it out.
The worst thing that could happen in shamblers scenario isnt the zombies, its man, they'd be roiting and looting everywere.