Arbitration Act 1940
Section 4
Waiver of Right to Object
A party who knows that -
(a) any provision of
this Part from which the parties may derogate, or
(b) any requirement
under the arbitration agreement,
has not been complied
with and yet proceeds with the arbitration without stating his objection to
such non-compliance without undue delay or, if a time limit is provided for
stating that objection, within that period of time, shall be deemed to have
waived his right to so object.