I originally asked this question on English Language & Usage but it was closed for being off-topic as it is asking for a possible (besides the obvious) interpretation of a TV show quote, not English language usage, so I'm trying my luck here:
In the 70s (or possibly 80s) the inimitable Patricia Routledge did a series of five short sketches for the BBC where she plays a woman named Kitty. Practically every sentence is a (pop) culture reference and I've been able to figure out most of them, but this one especially remains a mystery.
The video can be found here:. At around the 0:30 mark she uses the phrase "I hope you've sealed the envelope properly" - what does this mean? The context is that she's on the phone about to have a conversation with a stereotypical dungaree-wearing, chain-smoking lesbian television producer and she refers to it as "an old golfing retort."