We know that Tom signed an affidavit that contained falsehoods. There are currently two explanations on the table as to why he did this.

In the first, the explanation given by Tom, he was in a state of near panic as he felt he had betrayed his wife, and didn't want the lawyers to still be there when she arrived home. So he signed the affidavit, and, yes, you could say he perjured himself. But, he hadn't read it, and later took steps to retract it.

In the other scenario, he deliberately conspired with Elan Vital officials and their lawyers to sign an affidavit knowing it to be false. This is a much more serious charge than saying that he panicked and signed something he hadn't read.

So, both technically are perjury, but the second is with 'malice aforethought'.

Regarding why he gave the documents to John, I think that is simple. John had just written a long article about Rawat in the national Australian press, so if Tom was going to leak the documents (with no underhand motive), John was the natural person to leak them to. He had no idea who the webmaster of EPO was, wasn't (according to him) a reader of EPO or the ex-premie forum, so I wasn't an obvious choice of recipient.

And, sure, Tom expected John would publish the information in the documents in some form, but John had apparently promised that they would not be traceable back to Tom, and then John took no precautions whatsoever to prevent that.