Turns out us Londoners aren't the most observant lot, as just 23 percent of us can identify the official London Underground font. It's not like we see it every day and it's plastered across the roundels, signs and maps of 270 stations or anything. Oh, wait...

The survey by Solopress found that Londoners were twice as likely to recognise the font used by the BBC as they were Johnston Sans – the official Underground font which celebrates its 100th birthday this year. Though we guess we'll just have to put it down to the fact that the tube's signs and roundels are so iconic that we can't recognise the font out of context.

Think you're a font expert? See how you fare in Solopress's quiz.

More in tune with London's sounds? Then you might like this audio map of the city.