“The postman was an experienced member of the junior Bar who had a place in the Court of Exchequer by the post anciently used as a measure of length in excise cases. He had precedence in motions over all other juniors ….” Sir Robert Megarry, A Second Miscellany-at-Law 122 (1973).
postman
postman (pohst-m[schwa]n). Hist. A barrister in the Court of Exchequer who had precedence in motions. • The postman was so called because of the post he stood next to when making motions. Cf. TUBMAN.