ARTG3140 | Reviews and appeals for indirect taxes: Appealing against a decision or assessment: What the appeal must contain
From HM Revenue & Customs · Appeals reviews and tribunals guidance
The Tribunals Service require that the appeal must state
the name and address of the person making the appeal
the name and address of the representative of the person appealing
an address where documents for the person appealing may be sent or delivered
details of the assessment, decision or review conclusion appealed against
grounds of the appeal, see ARTG3150
the result the customer seeks from the appeal.
So if the customer does not use the Tribunals Service appeal form they must include this information in their letter of appeal.
The customer must also send the tribunal a copy of the decision letter, assessment or review conclusion they are appealing against.