a decision to issue certain information notices: a taxpayer notice (section 86 TCMA) or a third party notice in relation to subsidiary undertakings (section 90(3) TCMA, and
penderfyniad i ddyroddi rhai hysbysiadau gwybodaeth penodol: hysbysiad trethdalwr (adran 86 DCRhT) neu hysbysiad trydydd parti yng nghyswllt is-ymgymeriadau (adran 90(3) DCRhT