There are companies on the Alibaba who claim to be companies (Free Enlisted Companies). The will accept any price you offer for the products you are offering ask you for their commission on the price offered. They will even agree to a large sum of advance payment too.
They will negotiate their commission, ask for Performa Offer for and than suddenly they will request you to change the destination to any African port.
If you object the simple satisfying answer would be the L/C / TT will be sent from
Once these steps have competed you are waiting for Advance payment/L/c you will receive a mail requesting you an x amount of payment to be paid to British Commission to expedite the matter with in couple of days or else you have to appoint an attorney to represent you at the British High Commission to allow your product to be exported to x destination. In both cases you are required to send them x amount of money.
Please be aware, this is known as Nigerian Fraud any money you will send will be lost and you will never receive any payment / Letter of Credit
And Rest assures that the British High Commission can facilitate you in any other country other than you own country.
It will not be fair to generalize the opinion for every Nigerian. There are good business people too after all is a big business community.
The only thing that traps any one is greed. Work with in normal business norms and instincts, rest assured that you will not lose any money.
Secondly if you have any such inquiry which you feel is big enough to feel greedy or you think you need that contract to change your life search party details for possible scam on the net.
Do not send money to the buyers, as there is no such legal business practice in the world where the seller has to register himself in the buyer's country. All taxes, duties and registrations are on the buyers account