I have always thought that the only way to put a stop to him is using the press . We need a local paper or ideally TV or Radio in his area to start the ball rolling then others will pickup on the story. I have spent some time researching a number of journalists who have covered online fraud including Facebook marketplace. I will try contacting two in the next few days. If his local BBC radio station has any form of consumer program how about all of us who have been scammed contact them? As he's not a business I doubt local trading standards will be able to take any action. Once the press get involved, senior police will instruct that action must be taken, never known it fail....