Being real, I'd probably head to a Currys near a supermarket. Both are going to have solid shutters and loading bays. Food in the supermarkets, generator to power the fridges in the Currys, microwaves and kettles there, tvs to pass the time with films. That's all if I was caught short in my local town. Plenty of risks involved though if someone ramped through the shutters or we couldn't get to supplies due to loads of zombies.