A lot of people reacting here with a "But they're a Charity, so they most be good people" clearly are unfamiliar with the problems of Unpaid Internships in London and the scammy nature of so many UK-based Charities nowadays, especially the kind that's based in London, has junior "Personal Assistant" positions and whose "charitable objective" is the same as their name, a "painfully obvious bad thing", in a part of the "good will market" that's not yet saturated (such as for example the fight against hunger would be) and for a problem so broad that them having no measurable impact is justifiable and which is a problem that will never be totally solved - the entire thing reeks of a "business" set up by a Politician or MBA to pay themselves vast fortunes as CxO by preying on the good will of well intentioned people.

I lived for over a decade in London and that whole advert rings several alarm bells in my mind.