For those of you who would like to contribute to the latest disaster appeals, then the site in the UK to get your funds converted most quickly to the appropriate place is the Disasters Emergency Committee.
They concentrate on the latest appeals, and quickly get a specific fund set up within hours of a disaster. Having said that, there is nothing on line for China at the moment, but I expect that they have a fund if you want to pay over the telephone.
They work with all of the leading relief charities.
I made the mistake of donating through my favoured charity last week, and my credit card has still not yet been charged.
DEC accepts on line donations, is a registered charity so that you can add gift aid to your donation if you are a UK taxpayer. My guess is that is fine for non UK donators as well - you will need to quote a sterling amount - and may be the best international collection point.