Hello All
Thought you may be interested in a progress update.
Repot seems to have been successful, the tree has really thickened up, got rid of the black spot and white fly completely. Pot was a bit larger than I thought, but dont think it's too bad.
From my linited experience it looks very healthy, been getting quite a lot of flowers appearing as well. It has been a challenge but glad I persisted.
Thanks for the assistance folks to date.