Compensation scamming

The scammer sends a message thanking the victim for helping him start a transaction. They explain that since they have been able to leave regime-torn Nigeria (with your help) they have been residing and working in the UK and finishing the "transaction" without your help. The scammer informs the victim of their recent inheritance or partnership with a Brazilian businessman or and they would like to compensate you for your "release of some money." In order to claim the money the victim must contact the scammer's secretary immediately or else miss out of their share of a multi-million dollar sum.