The quality of acting like a stereotypical Brit.
This may include:
holding incredibly old-fashioned and
reactionary views
a fear of change,
the unknown or leftist politics
excessive stiffening of the upper lip
extreme examples of caution (caused by the fear of the unknown)
overuse of the terms sorry, please and
thankyou
probably being white, middle-class and male
finding youths distasteful
being modest to the point of irritating