A painstaking piecing together of all the various moments and clues that conclusively prove that Brig/Liz was a thing. And just what was the deal with Doris and Brighton?? I have a shocking new hypothesis! It could work.

*nods* And did Mike ever get a date with Jo, or was he seeing Sergeant Benton on the side? Was Benton seeing Jo on the side? What about all that shared-cell snuggling between the Doctor and Jo? And that's even before we get to Sarah chatting up Mike Yates, and all that Doctor/Master stuff. ;-)