Customs,festivals -
Christmas: most of the traditions can be dated back to the Mesopotamians, Christmas trees come from Germany, Father Christmas as we know him today comes from Coca-Cola, the original Santa Claus is really St Nicholas (Sinterklaas) who comes from Germany/Holland/Spain,
new year: most countries celebrate New Year. Welcoming the New Year in is not an exclusively British festival by any stretch of the imagination,
remembrance day: all European countries "celebrate" (not really the right term but YKWIM) remembrance/Armistice day. None more so that Germany.
trooping of the colour is celebrated in other countries that have ties to the UK (so not just a British thing)
may day originated in Pre-Christian Europe, and is celebrated as a worker's holiday almost everywhere except Britain.
pancake day has Roman Catholic origins so i would think it originated in Rome,
bonfire night - this is possibly the only truely British festival - because it celebrates someone almost managing to blow up the English Parliament.
St Georges day - Turkish/French/German,
mothers day - from the Bible originally, didn't have anything to do with your mother, was to do with your home town.
valentines day - Originally from Ancient Greece, now fairly worldwide.
fathers day - crass commercialist cash in on Mother's day (see Valentine's Day)
April fool - Worldwide,
bonfire night - same as bonfire night as above.
folklore - all countries have folklore, it's not an exclusively British thing.
i dont think many are 'imported'
Oh God - do i really have to go on?
Supersitions lucky, black cat from Japan
, touch wood,
originally it was iron that was lucky, to ward of the Fey, then it became something to do with the spirits that live in trees. since other countries also have trees, i would be hard pressed to say it is a truly exclusive British "tradition"
bad luck walk under a ladder,
the reason it's unlucky to walk under a ladder is because something might fall on your head/ since other countries also have gravity, i can not conclude that this is a British custom.
break a mirror, one magpie, spill salt, number 13, Ravens at tower of London, rabbit foot. I dont think many Countries have the same superstitions.
ok - i'm gonna stop now cause i'm bored and the baby is crying. but most "traditions", most "customs", most "Superstitions" can be traced back to wherever you'd like them to be. And as for being anti-British, i think the only true British traditions - and by that i mean what the world sees us for - is football violence, rudeness, and that our country is rife with paedophiles.
hardly cricket tea and cucumber sandwiches on the lawn is it?