I heard it so many times while riding the Tube that I began to long for it: the soothing, Brit-accented automaton telling me to please mind the gap between the train and the platform. What a kind reminder, huh? To keep me from falling to my death? I’d like to challenge my local public transportation here to do the same. Or perhaps I should challenge them to go a day without a breaking down? Ugh.
I miss London.
This Square Peg. 
I’ve been in London for a few months – but I’ve never seen a sign like the one you photographed. But apparently, the next time you visit it may be “Caution Gap!”
( http://www.timeout.com/london/blog/tfl-has-come-up-with-an-alternative-mind-the-gap-warning-092915 )
Lol – that photo was from Pinterest. 🙂 I wanted something to illustrate how I felt about the announcement from the loudspeaker. 🙂 I don’t remember seeing the Caution Gap signs though, but like you said, they may there when I visit again.
They haven’t started painting the new signs, yet, but I have a feeling they will always announce “Mind the Gap!” 🙂
Yay. 🙂