Cissy = Lesbian
A couple of years ago, for some reason, I started thinking about the old sitcom "You Rang, M'Lord?" which aired when I was aged from about 8 to about 13 I think. And it suddenly struck me that Cissy Meldrum was gay (really don't know why this revelation decided to hit me then!)
Watching the S1 DVDs I can now see it was all but spelled out that she was a lesbian and in a relationship with her "chum" Penelope - I was pretty surprised just how many references there were to it! As the BBC say on their Comedy Guide page about this programme, this was an unlikely place for a regular lesbian character to show up...!
From a couple of things Poppy says, she clearly has some idea what is going on - and Lord Meldrum's reaction is also very funny - trying to persuade Cissy not to wear men's clothes and wondering aloud whether to Teddy whether girls kiss each other on the lips these days...
Cissy and Ivy winking at each other in the first or second episode (Ivy presumably not in the same spirit as Cissy) was also very funny.
STOKES: Who's that tea tray for?
IVY: Miss Cissy.
STOKES: Well don't stay too long!
IVY: Why does everybody always say that?!