Evidence of anything said or done in the course of a compulsory conference is not admissible in any hearing before the Tribunal in the proceeding, except—
(a) where all parties agree to the giving of the evidence; or
(b) evidence of directions given at a compulsory conference or the reasons for those directions; or
(c) evidence of anything said or done that is relevant to—
(i) a proceeding for an offence in relation to the giving of false or misleading information; or
(ii) a proceeding under section 137 (contempt); or
(iii) a proceeding in relation to an order made under section 87(b)(i).