Follower notices
An FN can be issued in any enquiry or appeal case where HMRC is of the “opinion” that a judicial ruling (which must be a final one) is “relevant” (i.e., establishes principles which would govern the case in question).
It is possible to make “representations” to HMRC about an FN (which HMRC are obliged to “consider”) but there’s no appeal against an FN. Where an FN is issued (and upheld following representations) individuals will have to amend their return or withdraw the appeal. If this is not complied with, there’s a penalty of up to 50% of the tax at stake.