It’s a rewatch (I’ve seen the first two series several times now) but I’ve not watched for ages. I got to season 2, just before Martha showed up (which was gonna be the next ep). I was considering just doing until season 2 (and Stolen Earth/Journey’s end of Who) and then pretend children of earth never happened (I got the dvd of it but have never seen it, I only watched it when it was on tv)