Gillian said in May 2016 that someone had bought the rights to make her books into a tv. Series. Any idea how we figure out who that was and if that can be the Netflix link or production co link to PM?

We can’t find out until it’s officially announced, but the original plan of those books always was to be adapted on screen, and that Gillian could be directing, probably producing too. I think she wanted them to be a movie franchise, or just one movie, but apparently it’s going to be a tv series. I guess Netflix could absolutely be on board, and actually, I bet they will. But I don’t think PM will. First, I truly believe their relationship stops at The Crown right now, and he has stated that he hates sci-fi.
Maybe Gillian will adapt the books to a screenplay herself.