Hi Angela,
Was your appeal via an MR or FtT ? If it was Mandatory Reconsideration, then you can take it to the First Tier Tribunal, but if it was FtT, then you can escalate it to the UtT ( Upper Tier ) to be looked at, and if an error of law is found, then they will advise you from there. I recently had a UTT with an error of law and it's been referred back to a new FtT to be dealt with in June via telephone.
Hope this helps,
Chris.
Nothing on this board constitutes legal advice - always consult a professional about specific problems