Thanks for all the help! Picked him up a few days ago, it looks like a Pterodoras Granulosus but I could be wrong, just a quick snap shot of him/her. He's a good eater and comes out every now and then to roam around the tank. Will try and get some close ups once he comes out again.
From that angle it looks like a ripsaw cat. The head looks wider though, so i'm probably wrong.
If it is a ripsaw, you're in luck. As long as you have a tank big enough (no small thing) these guys make good pets, and can even become tame enough to let you pet them.