Ok, I've always ridden "English." I was taught to sit up straight, heels down. I've seen videos of "huntseat" and the riders lean slightly forward at most gaits except the walk. At least in the videos I've seen.
The new barn I'm at they asked what style I ride and I said English, but that I mostly jump, do some dressage very badly and my heart is really in cross country. The BO is also the local trainer. He said "Oh, so that's huntseat."
So, do I ride English or huntseat? To be perfectly honest I hadn't heard of huntseat til I came to the US so I don't know all the terminology.