If you feel that you were deceived into handing over money, I would suggest that you contact "Action Fraud" on 0300 123 2040 or
Action Fraud | Report fraud and internet crime
The more first-hand accounts the police have from victims of his deception, the more likely they are to be able to secure a prosecution and the less likely it will be that Nick will simply move on and start all over again with another "company".
If they had been aware of the extent of his deception and the length of time that it had been going on (some three years, now), I'm sure they'd have been taking a very close look at his practices long before now.
Better late than never.
Paul..