Those are great! Here's a few to add:

You have your 'winning the war was a joint effort' speech prepared for the moment an American so much as mentions WWII

You gloat for hours every time a film actually gets releaced first in Britain

You're secretly proud of the fact that Pop Idol and Big Brother were British ideas, just because they caught on so well everywhere else

You'd never, ever admit to being patriotic because it seems to mean being somehow loyal to Prince Phillip...

... but suddenly it was ok when England won the rugby world cup

You denounce American football as 'rugby for wusses'

You go to the seaside in summer and sit shivering on the beach with an ice cream, determined to enjoy yourself despite the drizzle