"15 Extension of time limits (1) Where a complaint is presented to an employment tribunal under a jurisdiction listed in Schedule 3 or 4 and- (a) either of the dismissal and disciplinary procedures is the applicable statutory procedure and the circumstances specified in paragraph (2) apply; or (b) either of the grievance procedures is the applicable statutory procedure and the circumstances specified in paragraph (3) apply; the normal time limit for presenting the complaint is extended for a period of three months beginning with the day after the day on which it would otherwise have expired. (2) The circumstances referred to in paragraph (1)(a) are that the employee presents a complaint to the tribunal after the expiry of the normal time limit for presenting the complaint but had reasonable grounds for believing, when that time limit expired, that a dismissal or disciplinary procedure, whether statutory or otherwise…was being followed in respect of matters that consisted of or included the substance of the tribunal complaint. (3) The circumstances referred to in paragraph (1)(b) are that the employee presents a complaint to the tribunal- (a) within the normal time limit for presenting the complaint but in circumstances in which section 32(2) or (3) of the 2002 Act does not permit him to do so; or (b) after the expiry of the normal time limit for presenting the complaint, having complied with paragraph 6 or 9 of Schedule 2 in relation to his grievance within that normal time limit."
"(6) Neither of the grievance procedures applies where the grievance is that the employer has taken or is contemplating taking relevant disciplinary action against the employee unless one of the reasons for the grievance is a reason mentioned in regulation 7(1)."
"7 Circumstances in which parties are treated as complying with the grievance procedures (1) Where the grievance is that the employer has taken or is contemplating taking relevant disciplinary action against the employee and one of the reasons for the grievance is- (a) that the relevant disciplinary action amounted to or, if it took place, would amount to unlawful discrimination, or (b) that the grounds on which the employer took the action or is contemplating taking it were or are unrelated to the grounds on which he asserted that he took the action or is asserting that he is contemplating taking it, the standard grievance procedure or, as the case may be, modified grievance procedure shall apply but the parties shall be treated as having complied with the applicable procedure if the employee complies with the requirement in paragraph (2)."