Porridge Oats?

I've got a recipe from the UK I'd like to try making... but it calls for "Porridge Oats" and, even after a bit of searching on the web, I'm a bit unclear on what these are, exactly. I know that oats can vary greatly depending on how they are processed... I just haven't had any luck figuring out which version of the types available in the US would best fit.

Any advice would be greatly appreciated!

Crossposted from my Livejournal