Thanks guys, its definitely not a crassula ovata or portulacaria afra, I have side by side with both of those:
Unknown succubus vs portulacaria afra
Unknown succubus vs Crassula Ovata
It's actually in a very healthy state, and it's getting about 8 hours of sun right now, its winter over here so it did drop a few leaves, and I've been watering sparsely. We've had some awesome weather recently, so it's really greened up quite a bit in the past week.
The Crassula helmsii shout is a good one, at first glance the leaves are very similar, but mine usually only has one or two pairs at the end of a branch, and it's not a huge water lover like the helmsii, it thrives on the same kind of care you'd give a normal jade plant.
Oh yes, i forgot to mention, the leaves don't get much bigger than on my potted ones.