Form N161 is the prescribed form of notice for all costs appeals. On an appeal from a costs officer the notice, once filed, will be served on other parties by the court office. On an appeal from a Costs Judge the appellant must arrange service of a copy of the notice on each respondent as soon as practicable and, in any event, within seven days after filing. 

Form N161 summarises the documents which should be prepared in support of the appeal. In particular, the appellant must supply a suitable record of the judgment being appealed, i.e. an approved transcript or a written judgment signed by the Costs Officer. Alternatively, the costs officer’s comments written on the bill may be used

Form N162 is the prescribed form of respondent’s notice for all costs appeals. However, a respondent is not required to serve a respondent’s notice if it intends to rely solely upon the judgment of the court below for the reasons given by that court.

Extract from the Senior Courts Costs Office Guide 2018