At the risk of sounding like a broken record: Obtaining money by deception is a criminal offence.
These guys should take you seriously if you contact them...
Action Fraud | Report fraud and internet crime
I wouldn't even bother with the Trading Standards muppets. They're too inclined to just say, "Please... Pretty please...".
The more people who make reports to this outfit, the more evidence they will have that an offence has been committed and the more inclined they will be to instigate a prosecution. Alternatively, do as others have done and start civil proceedings against Nick although now that the company is heading for liquidation you may have to join the queue (although I'd love to know to where the supposed $20,000 investment has disappeared).
My guess would be Nick's pocket.
I call shenanigans...
Paul..