I cant recall sliced haggis being fried though... I dont think it would stick together without the skin...
I'm thinking the same thing. I don't see how it would hold together like a hamburger patty unless it had a breading on the outside (and were deep-fried). Or possibly if you mixed an egg into it, it could hold together like a meat-loaf. But plain old haggis would likely not survive as a patty without aid of some sort.

That said, I have pan-fried haggis before. It was leftover from a traditional meal, and I wanted to have it with breakfast. So I pan-fried it with a little oil, tossing it all about and keeping it loose, then added some diced onion, and finally scrambled some eggs with it. The entire concoction went onto a tortilla and became a Scots-inspired breakfast taco.