OMG, I totally forgot to squee over Martha's total lesbian flirting with Chantho. Chantho was blue! Martha encouraged her to swear! They bonded over having to deal with self-absorbed Time Lord types! It was glorious!
I used to think this was a new series thing (and it did get started in the new series as soon as Rose got away from Mickey -- you know, I still miss Raffalo ... [Hmm. I have a blue thing going on here, don't I?]) but the more I rewatch the old show the more I realise that as soon as there are women in the guest cast the companions start flirting with them.
And of course, it goes back almost to the very beginning, doesn't it? Susan/Ping Cho and all that. I must obtain some version of Marco Polo so I can get on board that bandwagon.