ARTG2130 | Reviews and appeals for direct taxes: Appealing against a decision: What is an appeal
From HM Revenue & Customs · Appeals reviews and tribunals guidance
For a customer’s disagreement with an HMRC direct tax decision to be an appeal it must be
If it is obvious from the customer’s communication that they want to make an appeal but they do not include all the required information, the decision maker should contact the customer to obtain the necessary information.