Yes, they are. Numerous complaints of fraud. It's an "advance fee" scam.

An advance fee scam is a form of consumer fraud which involves obtaining a small amount of money from a victim in advance of a larger deferred benefit, such as a job, a high rate of return, or a share of some ill-gotten gain.

020 is the area code for london in the uk

this number has been associted with advance fee fraud

The cash advance fee on a Capital One credit card is 3% of the advance, with a minimum of $10.

The EFCC (Economic and Financial Crimes Commission) is a Nigerian law enforcement agency that investigates financial crimes such as advance fee fraud (419 fraud) and money laundering. The current Executive Chairman is Farida Mzamber Waziri.