^ There is also a more direct reference. In RotC, Mr. Crane drives an International Electromatics lorry - the same company ran by Tobias Vaughan in The Invasion.
Wow I never twigged that (Probably because I hadn't seen the invasion when I saw the Cyberman 2-parter.) I have to say that I've never been a huge fan of the NuWho Cybermen 2 parter, and I have to say that The Invasion has made me even less of a fan. It's actually a very mature story- was this really a kids show in the 60s?
Yep. This story was also the trial balloon for Who's direction in Season 7, and if you've never seen any of those...well, let's just say that these are some of most mature (downright adult) Who's ever made. Season 8 and beyond in Pertwee toned it down a tad. In fact, with a few exceptions (like the stories in Season 13), I don't recall stories as mature as these at all in later Who until The Caves of Androzani. Let's face it that sequence where Stotz and Krelper go at it on the surface and the bit where Morgus murders the President isn't exactly children's fare.