I live right outside Cardiff, which is the capital of Wales. Right in the city centre is the prison. I'd hold up there. It's full of food and guns, surrounded by a massive perimeter wall, it has its own supply of electricity and if the zombies get in then it can be locked down. I just gotta hope that all the inmates are locked in their cells when they inevitably turn into zombies, otherwise it'd be the stupidest place in the world to go. If they are in the cells, then all i gotta worry about is the undead prison guards. I'd probably need to pop into a sporting shop to pick up some guns and shit first. After that i'll hold up in the prison until either me or the zombies are all dead. Although, the prison at night would be pretty scary. Also you could put zombies in the cells to experiment on them. However, if there was an outbreak, it would never go to plan. Something would be bound to go wrong.