Too 'B', even for IMDB

There's a Welsh language horror film that I first saw when I was five years old called Gwaed ar y Ser, which translates to Blood on the Stars. It's kind of a Wicker Man meets Celebrity Big Brother come slasher movie about this group of sinister kids who are going around killing the minor celebrities of Wales in the 70s, occasionally with snakes. They electrocute and kill the leading harp player by connecting her harp to the mains; they blow up the most famous rugby player by putting a bomb inside the ball... I think they blow up Barry John, he’s a rugby legend! The light entertainment TV personalities I used to see on telly every day were being murdered in front of my face, I had to be carried out of the cinema screaming. Now that’s definitely a B-movie. I mean, it’s beyond B-movie. Maybe it’s a C or D. I got a copy of it a few years ago, it hasn’t really been shown anywhere since 1976 and it’s still incredible.