If you guessed c) you have a great memory, but chances are you still have no clue when it comes do deciphering the mnemonic. (The BBC tried to decipher it a few years' ago if you’re at a loss!)

The Splink! campaign, of course, was just one of many public information films that you may remember appearing just before the national anthem when BBC one would close down for the evening. You don't remember that? I guess we really are getting old then...