When I am dead and gone, say only this of me: he really, really liked 'The Fiend' ('Beware My Brethren' in the US). Like it? I love it. I love the music, the performances, the brown and olive world of the early 1970's, Tony Beckley, Patrick Magee, I love it all.
Beckley plays Kenny, a deeply religious security guard who lives with his aged Mum and, in his spare time, is a perverted sex killer. He's grown up twisted as a result of belonging to a very odd (but pretty funky) cult led by the ever bonkers Patrick Magee. The resulting tale is one of the most entertaining in the British horror canon, and it's just come out on DVD, so go and get it got immediately.
Here's the opening sequence of the film, which should probably clear up the whole 'shall I - shan't I' debate immediately. Bloody marvellous.