Outside the Box: Brexiteers all following each other over a cliff

I live on the south coast of England, by the white cliffs. That’s roughly halfway between London and the French coast, were I a seagull. (I’m not, but as an Irish citizen with an Irish passport, I can still move around with as much ease, no matter what those eejits in Downing Street end up doing.)
Anyway, on the white cliffs the other day, several hundred people gathered, holding mirrors to flash an SOS to France: Dot dot dot dash dash dash dot dot dot.