66   Effect of a review decision

(1)  A decision determining an application for a review of a reviewable decision takes effect on the date on which it is given or such later date as may be specified in the decision.

(2)  If any such decision varies, or is made in substitution for, an administrator’s decision, the decision of the Tribunal is taken:

(a)  to be the decision of the administrator (other than for the purposes of a review under this Chapter), and

(b)  to have had effect as the decision of the administrator on and from the date of the administrator’s actual decision, unless the Tribunal orders otherwise.