“No action will lie against a witness (whether an expert witness or a witness of fact) for defamatory words spoken in his character of witness with reference to the inquiry upon which he is called or required to give evidence, even though such words were irrelevant and spoken maliciously and without reasonable or probable cause. … Like the judicial immunity the rule is established not for the benefit of malicious witnesses but for the public benefit to prevent honest witnesses being deterred from telling the truth by fear of action. It has also been pointed out that the trial process contains in itself, in the subjection to cross-examination and confrontation with other evidence, some safeguard against careless, malicious or untruthful evidence. The privilege which protects a witness from an action for defamation in respect of his evidence in a judicial proceeding applies not only to evidence given viva voce, but also to statements contained in an affidavit, a witness statement, or in a document handed in by a witness at the close of his examination. However, privilege extends a good way beyond what is said or done in court. It has long been the case that if the person making the statement was called or proposed to be called as a witness then the protection of absolute privilege would extend to what he said while a proof of his evidence was being taken and the same was so in respect of interviews with the object of possibly calling him at the trial”