12. In the taxation of accounts as between party and party where counsel is employed—
(a)counsel’s fees and the fees for instruction of counsel in paragraph 19 of Chapter ll or in a detailed account charged under Chapter III of the Table of Fees are to be allowed only where the sheriff has sanctioned the employment of counsel; and
(b)except on cause shown fees to counsel and solicitor for only one consultation in the course of the case are to be allowed except where counsel is employed both before the sheriff and the sheriff principal and there is a consultation prior to the debate on the appeal when fees for an additional consultation are to be allowed.