You should consult your local authorities right to appeal a decision/procedure under their own localised scheme.
You also have the right to appeal to the Valuation Tribunal Service on any decision. This includes a decision on the exercise of an authority's discretion, that there is a liability for council tax, or the amount of council tax payable, as long as:
Your local authority will not allow an appeal
You are not satisfied with the steps your local authority is taking to resolve your grievance
No decision to the appeal has been given and it has been more than two months
All appeals to the Valuation Tribunal are required to be in writing. Time limits to appeal to the valuation tribunal will vary depending on the reason you are making the appeal and the response of your local authority.
An appeal against the decision of the Valuation Tribunal can be made to the Upper Tribunal and to the High Court if the appeal is in respect of a point of law only.
The Valuation Tribunal Service has published a booklet guidance on preparing for an appeal against a council tax reduction scheme decision.