I just got back from my dad's house where I saw this.
The movie goes by a few titles, actually: "Let Sleeping Corpses Lie", "Don't Open the Window", and the title this particular copy went by "The Living Dead at Manchester Morgue".
The main-characters
Better than I expected actually. A great little zombie flick, especially considering the time of it's release (1973). A bit gorier than I expected, for the same reason. But I guess this was when Texas Chainsaw Massacre had just scared the piss out of everyone.
The beginning was a little slow to get into, but once things start happening, it's a pretty cool movie that delivers some great zombie scenes and gore scenes. And it's British (but I don't mind British horror movies).
Local farmers start using a new "envirnmentally safe" pest-control technology that uses ultra-sonic waves. It's designed to work on simple nervouse systems only, and drives the pests to kill each other. But unknown to everyone, it's also waking the local dead.
Once the first murder or two happens, two travellers passing through are pegged for the murders. Of course the police don't believe their story of the walking dead. The movie follows the two characters trying to escape the grip of the police and trying to survive the horror of the flesh-eating fiends.
If you're into zombie flicks, this one is worth checking out.