What I noticed a while ago is that in England nobody seems to care too much to congratulate someone on his/her birthday on the exact date!
I don't see myself as overly superstitious but in this case I am and this habit can make me really furious.
If my birthday e.g. was on a monday then here I could happily have a party on the saturday before as it's more convinient. Unbelievable for me and I hope not only for me. If someone wishes me happy birthday too early I somehow assume that now the chances for desaster to happen are very high and I won't make it till then any more...and if only to prove my point ;-)
PS: And I will come up with a positive fact about the UK again soon I promise...this never was supposed to be one of those "What Brits do wrong" lists!