26   Defence of contextual truth

It is a defence to the publication of defamatory matter if the defendant proves that:

(a)  the matter carried, in addition to the defamatory imputations of which the plaintiff complains, one or more other imputations (contextual imputations) that are substantially true, and

(b)  the defamatory imputations do not further harm the reputation of the plaintiff because of the substantial truth of the contextual imputations.