I'd probably find shelter in one of the local nuclear plants. They have well-equipped paramilitary guards and tank trenches surrounding the premises. Not quite a military base, but would still hold off zombies for a while.
I hope you know how to turn off a nuclear power plant without having it blow up, meltdown, or both.
I would expect most modern power plants to do this safely more or less automatically. Of course, I could be horribly wrong.
That said, a nuclear power plant is probably one of the better places to defend if you could hold up in one. And you'd have power for extended periods, I'm pretty sure the fuel rods are good for years, maybe decades. They probably keep them in some sort of rotation though, so no idea how long you could go without refueling.
The fuel rods? Ha, no problem, those will last for a LONG time. The cooling system on the other hand.... Depends, graphite bauble systems :3 nuclear power plants (most modern one's) should last for an equally long time, but yeah, once the power is out, emergency power is out, or worse, transformer's are overloaded, and the rods melt through their containers...
OH GAWD RADIOACTIVE CANCER ZOMBIES.
Besides people, zombies wouldn't need to bite you, just get some blood on your body [hands, face, open wounds] and you'd be insta screwed.
And all it would take is for rabies to become airborne and you already have 28 weeks later zombies D:
My plan is, well you've always heard the saying an Englishman's home is his castle....
GAME ON ZOMBIES.
*I also remembered something, the SAS is one of the, if not
the best elite army force currently existing today, and they're trained to fight in close quarter environments, and are trained to kill with headshots. How are these guys not the perfect zombie kill squad?!!! They just need a Francis... Bill....
Interesting thing to note here, scientists have already made a way to create zombie cells, cells that don't die.
Problem is, the cells don't die even when damaged, hence, zombie cells. Though in reality this would probably make walking vegetables but still :/