I think that the people involved in Lesbian Vampire Killers had just watched Shaun Of The Dead, Hot Fuzz & Bitch Slap for inspiration. LVK is not as clever/funny as Shaun OTD or H Fuzz, or as sexy/crazy as B Slap, but it is an enjoyable watch which probably gets more enjoyable the more you drink.
The plot is fairly basic and goes something like this. Two blokes get sacked/dumped and decide to go hiking. They meet some hot euro-chicks, but then some lesbian vampires come along and turn the hot euro-chicks into lesbian vampires (except for one of them who stays a hot euro-chick). Then one of the blokes and the hot euro-chick get caught by the queen of the lesbian vampires, and the other bloke has to rescue them (which he does), then they kill the queen of the lesbian vampires, which means all the other lesbian vampires can stop being a lesbian vampire, and they all live happily ever after and decide to find more lesbian vampires to kill. The end.
There are a couple of funny bits but mostly its just mildly amusing. The girls are sexy (I think one of them was in Hollyoaks) and the sets are creepy in a "carry on" sort of way (lots of fake fog). I doubt if LVK won any awards, but its good harmless fun and if you just want a couple of hours of pointless childish crap then Lesbian Vampire Killers is just that. Crap, but good crap!