Welcome to Scamwarners Tools.
Being a member here will give you the opportunity to see the scale of the problem. As well as the victims of the car scams, there is also a major ongoing fraud involving agricultural and construction machinery which tends to be based on fake web sites where the victims are largely in Eastern Europe with the sites claiming the companies to be based in England and now Ireland. Underlying many of these frauds are scam employment sites attempting to recruit money mules. It'll take you a while to find your way around the various forums, and victims don't always post their experiences in the appropriate places, so don't expect to find all information in the right place.
Without doubt there is one major organised gang at work but I suspect that there are many 'copycats' too.
Pressure has to be put on UK banks to be strict with those who launder payments for criminals, whether they are innocent dupes or not, and it's well known that many aren't innocent or dupes. We know that the FOS won't help victims and they have suggested that details are passed to the FCA so that at least they are made aware of the failings of particular banks to properly administer UK money laundering legislation. I always suggest that victims write to the bank involved by recorded mail pointing out their responsibilities as regards the legislation to make a report to the FCA on any account involved in fraud. Such a letter gives the bank little option as I suspect that many aren't doing what they should. Then this problem is so widespread in the UK people should contact their MP about the problem in general. This is a good time to give your MP things to do with an election looming and contacting your MP is easy to do using an online site that monitors how MP's respond to issues raised by their constituents.
You might also be interested in this fraud variation where the scammer targets the seller
http://www.scamwarners.com/forum/viewtopic.php?f=6&t=77280