Sorry, it was April of course. I don't know what happened there. Jane was interviewed on 8th and Fiona on 10th. The Telecinco broadcast was on 10th. The Portuguese officers were still in Rngland then, the first to return to Portugal was Rebelo on 11th. So very unlikely that Telecinco had any rog interviews.
They wouldn't have had any transcripts, but they could have had a copy of the CDs. If that's the case, it wouldn't take much to upload it to a file-sharing site (if any were around in those days), or for someone to type out some of the "juicy" bits and pass it along by e-mail.
I very much doubt that LP leaked - to find again, but they even held an internal inquiry at some point, although I think (not certain) that that was prior to the rogs.
I also very much doubt that Rebelo leaked, either. Apart from the crying incident, I don't recall any other leaks under him, or at least none that couldn't have been leaked before he took over.
I also very much doubt that Kate and Gerry (or anyone associated with them) would have planted it to have a moan at the PJ, just when they were trying to draw media attention to Brussels.
In the Expresso article I linked to earlier, Nacho had apparently said that he had documents (plural) and that he would soon be revealing more. As far as I know, that didn't materialise - my guess would be that Rebelo put his foot down.
I'm now tending to think that Jane's is the most likely source for the "mummy" statement, due to the date), but I still haven't found a source for the "Gerry and I talked about it for a few minutes" one.
An alternative is that the source is Kate after all, recorded in an "informal" interview prior to arguida time and kept to leak on a rainy day.