In case people are interested, Wikimedias Deutschland and France have
received similar questions from Sue and have posted their responses on
meta:
http://meta.wikimedia.org/wiki/Fundraising_and_Funds_Dissemination/Payment_processing_%28questions_for_the_German_chapter%29
http://meta.wikimedia.org/wiki/Wikimedia_France/Fundraising_letter_March_2012
I see from the minutes that WMUK's board discussed their response at
their meeting on Saturday, so I presume the final version of that will
be going up on meta very shortly.