I was unsure with what type of tree I was dealing with, and wanted to make sure before re-potting to have the best soil environment for it
It is now at home, and happy re-potted.
When I re-potted it sadly it barely had any root growth (or it had recently been re-potted and cut back) so I just left it alone.
The root ball was smaller than a couple can of altoids stacked together, and it had only 1-2 big roots (looked like they may have been important ones)
hanging down so I left it be.
I was pretty surprised at the small amount of roots.