Hey Nick,
I can't give you any advice on the money front I'm afraid, but as a fellow brit in his early 20s who is going out to Angola in a weeks time, I can offer you a contact for when you first arrive.Â
Drop me a line when you get out there and i'll try and dispense any tips that I think may help you settle in. Also, let me know if you fancy a beer, because likewise i don't know anyone out there!
All the best in your transition. See you in Africa!
Jeremy