Poor Man's Buffy
I'm an avid Buffy fan. I even have the comic books from Season 8. The first episode feels like a perverted buffy episode Season 1. As a matter of fact, it's more like the *beep* Buffy movie that nobody considers to be canon.
shareConsidering that there are two main characters(even if they aren't sisters instead of brothers) who fight demons, it's closer to a british Supernatural.
Edit: spoilers for both shows one of the two main characters has "special power" and have at least one main character summon demons that end up taking over human bodies.