119. If a party to arbitral proceedings under this Scheme takes part, or continues to take part, in the proceedings without making, either forthwith or within such time as is allowed by the arbitrator or by any provision in this Scheme, any objection:—
(i)that the arbitrator lacks substantive jurisdiction (as defined in paragraph 113 above),
(ii)that the proceedings have been improperly conducted,
(iii)that there has been a failure to comply with the Arbitration Agreement or any provision of this Scheme, or
(iv)that there has been any other irregularity affecting the arbitrator or the proceedings,
he or she may not raise that objection later, before the arbitrator or the court, unless he or she shows that, at the time he or she took part or continued to take part in the proceedings, he or she did not know and could not with reasonable diligence have discovered the grounds for the objection.