Red Velvet Cake which is definitely an American creation is also popular across the pond. According to Entertainment Tonight, Princess Eugenie's wedding cake will be a "traditional red velvet and chocolate cake for their special day".
Here's some red velvet blog posts:
Super Tall Red Velvet Cupcakes
The Red Velvet Cake Debate
Red Velvet Cheesecake Recipe
Red Velvet Cake Balls