" a distinction is to be drawn between decisions which are made under rule 13(8) and those made as a result of the enlarged powers granted to chairmen to act alone under the Employment Tribunals Act sections 2 and 3. Decisions made under rule 13(8) relate to those matters in respect to which chairman have power to act alone by virtue of the rules as for the example the power to hear and determine an issue relating to the entitlement of an party to bring or contest proceedings under rule 6. Where a chairman sits alone to hear such a matter, he is prevented by rule 11(6)(b) from reviewing his own decision. On the other hand, where a chairman sits alone to hear proceedings, (i.e. originating applications) by virtue of the express powers granted by the ETA s4(2) and (3), his decision is not made under 13(8) but under the ETA, with the result that the exception does not apply and he is the proper person to hear the review. A chairman acting alone may not however conduct a review of a decision reached by a full hearing rule 13(8) C."