The sentencing judge described Burton's offending as "major, calculated and reasonably cunning".
In late October in the High Court, Justice Simon Moore considered whether Burton should be struck off the roll of barristers and solicitors after an application from the Law Society.
"As an employee he owed a duty to his employer to act in their best interests. Not only did he breach that duty of good faith but, through his actions, he caused considerable embarrassment to his employers and, no doubt, damage to their reputation within the legal community," the judge said.
Justice Moore felt Burton should be struck off, but the law required him to refer the matter to the Court of Appeal.
There, Justices Tony Randerson, Rhys Harrison and Lynton Stevens made an order striking Burton off.