Bloodsuckers (aka Incense for the Damned) is so very bad, the dear director (the British Jesus Franco?) asked for his blessed name to be taken off the credits after the producers edited it out of all recognition. Be sure you have some matchsticks handy to prop your eyes open, dears.
The first scene at Oxford (where there’s a cut at the end of just about every one-word sentence) is simply hilarious. You just know you’re in for something special when you see that.
The book it’s based on, Simon Raven’s “Doctors Wear Scarlet” (1960), is actually rather good though!