I agree llb, this prices are a bit crazy esp when other countries are still the same price. I got a belt for £313 just before xmas, it is now £350.
I don't think it only happened in UK though. I was at an H store during a business trip last week. The price has already been increased, now it costs EURO 275 for a 90x90 Carre and if I remember right, a 30 Birkin went up about 10%.
H website in other european countries increased their price today too.