Marky
The CAB do still represent claimants at First Tier Tribunals but only rarely as they are no longer funded by Legal Aid.
At the risk of putting you off of the appeal process entirely, even with a Representative, the panel will direct the vast majority of their questions at you if you opt for an Oral hearing that you attend, so you need to be prepared for this.
Instead of an Oral hearing you can request a Paper one, where a Decision is made purely from the papers you submit in regard the appeal. The downside is that the success rate for Paper hearing is significantly lower than for Oral ones, the Tribunal panel being able to hear the claimant describe their day to day problems, can really make a big difference to the Decision they reach.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems