Yes, I agree it is confusing; however as WM-UK contributes a significant sum of money from the UK fundraiser (more than half) to WMF and organizes events that promote the use and improvement of Wikimedia projects, that these outcomes have public benefit in the context of our UK charity's mission is as important to demonstrate as our direct activities.
Cheers, Fae -- http://enwp.org/user_talk:fae Guide to email tags: http://j.mp/faetags