I have just learnt that today is Flag Day in the United States. (Hattip Walaa Idris: Happy Flag Day!) I have to admit to not being aware of this before but then Flag Day probably has about as much trans-Atlantic awareness as the Queen's Official Birthday.
I'm surprised that the US needs a special day for the flag as they seem to have it on display all the time. By contrast it's much rarer to see the Union Jack * flown here, even though most government departments can now fly it all year round, expect perhaps during international football matches.
In recent years some politicians have suggested that we need to wave the flag a bit more as though it will solve the problems of integration in British society. (Well okay some of them also talk about tinkering with the school history curriculum as a magic wand solution.) That rather misses one of the key factors of the British national character - we tend to be reserved and not shout about these things. A special day to commemorate the flag is about as British as the White House.
(* Before some pedant starts writing in the comments; it's not 100% clear that "It's only called the Union Jack when at sea" is accurate. And regardless of regulations it's the familiar name for the flag.)