My dear chap!
I suggest to you that if you are EVEN CONSIDERING going to, working in or handing over £500 to a company in Nigeria you should instead invest the money in seeing a very expensive psychiatrist as soon as possible!!
Have you ever been to Africa? Steer clear at all costs! It is not worth the heartache and if I did not want to remain PC, as we all do these days, I would say from experience that it is a shxx hxle.