There a quite a few, I think it'll be Plan
http://www.plan-uk.org/I'm fairly cynical and I like to see accounts and to be honest I like the admission that only 82% goes directly on charitable expenditure (13% on fundraising - fine by me if that means that they get over 13% more money as a result, 3% admin costs, 2% support costs). I don't believe 100% of my money will get to Africa and appreciate the truth.
Looking through the charity webpages was pretty grim, they all need money and I can't help them all.