CH414150 | Charging penalties: appeals: advising the person about their right of appeal
From HM Revenue & Customs · Compliance Handbook
The penalty notice and penalty suspension notice explains the person’s right to:
appeal
request an internal review and/or
notify their appeal to the tribunal to decide the matter
The notice also directs the person to Factsheet HMRC1 HMRC decisions - what to do if you disagree (HMRC website).