That being the case, and since you seem to have discovered where their operating headquarters are,why don't you take the further initiative of reporting them to the proper authorities in England? As you have said, they are all over the web trying to lure teachers; furthermore, there have have been numerous complaints about them, and I doubt you would have too much difficulty finding teachers willing to back you up on your claim that they are fraudulent.
I've dealt with GEVU myself in the past by following a link in what seemed to be a reputable website. Yes, they often post ads for high paying jobs that don't seem to pan out and then of course is the matter of the payment they expect from you to get such a job. NEVER PAY RECRUITERS...............NEVER PAY RECRUITERS..............NEVER PAY RECRUITERS. It's been written here and elswhere countless times, yet people still fall victim to these scams.