55 On the other hand, if the appellant intends by the proposed par 13, or any part of it, to advance a case that the consignments Vetrotex fibreglass gun rovings were contaminated, and thereby not fit for purpose or were not of merchantable quality, by reason of some defect other than, and independent of, alleged excessive moisture content I would, on the pleadings as they presently stand, refuse leave to make any such amendment. The reason for this refusal is because such an allegation would be irrelevant in a case where the appellant is only seeking indemnity for any liability which it may be found to have to the plaintiff in circumstances where the plaintiff makes no allegation about the unsuitability of the product other than alleged excessive moisture content. I have already concluded that the allegation proposed, if in fact it is intended to advance the existence of a defect of a character other than excessive moisture content, is, in my opinion, within the scope of the third party notice, but it is not relevant, at present, to the appellant's claim for indemnity in respect of the particular case being advanced by the plaintiff. That circumstance might possibly change and if it does the situation could then need to be reconsidered. It follows, therefore, that I consider with respect that McKechnie J was correct in the ultimate conclusion that an amendment, as proposed by par 13 of the minute of amended statement of claim, could not introduce an allegation of the existence of a defect in the product independent of, or unrelated to, the alleged excessive water content of the gun rovings.