Yeah... so peeved we don't have hunter-jumper in Aus, my boy's a bit quick for it but it would be so much fun! I haven't actually done a lot of flat showing, I mostly just show in jumpers and a little bit of eventing... I watch, though. I watch a lot of show hunter and hack classes. And I can present for them decently well, not brilliantly, but well enough to look the part. I would love to do more of it but jumping is more fun for me so I usually go to shows that have jumpers, and throw in some flat showing if the shows I'm already going to have it.
And, Nationals? Awesome! You must be good, then!