They'd probably accept a four year US degree provided there was a senior thesis involved. A regular degree from a British university is 3 years, an Honours degree is 4 years with a research component. Kinda like a hardcore senior thesis, but I'm told when converting stuff like that, as long as you have a decent GPA and a solid senior thesis tucked under your belt, they look favourably upon it.

Plus I think your Classic-Horror.com experience would look great on the application :)