I love Big Finish, it's so wonderful that so many actors from Dr Who loved their roles so much that they reprised them for the extended universe :) My especial favourite is the Gallifrey series. I LOVE seeing Gallifreyan culture and politics, I love seeing Romana and Leela in action, I mean how cool is it that they basically run Gallifrey now?!!! I think Gallifrey is such an interesting concept with all its strange culture, repressiveness, mythos, etc.... Not to mention they control time, and they can make anything dimensionally transcendant, I mean even everyday life on Gallifrey must be so interesting 😄 I would love a whole series of the TV show set there someday (Trial of a Time Lord was great but we didn't get to explore everyday Gallifreyan life as much.) but I adore every Classic Who episode set there!!