After David Cameron failed his British culture test on the David Letterman show we put London Mayor Boris Johnson to the test today.
Watch the video below to see if Boris knew that Thomas Arne composed Rule Britannia and that Magna Carta translates to Great Charter.
Ouch! David Cameron may regret ever appearing on the Late Show with David Letterman.
David Cameron was subjected to a quiz on British culture and history as he appeared on one of the US's most influential chat shows.
The Prime Minister has agreed to an interview with David Letterman - a host notorious for setting his own agenda. This could be interesting.