Thanks @Bluepaul, its not specifically a Xenforo thing and is coming from the adverts - but forums have been targeted by the scammers (as you say, not just RTG. Speaking to other forum owners, many have been hit). The problem is that we all sell our ad space through ad-exchanges and the ads basically go to the highest bidder but we have little control over what is actually displayed. It's always worse at holiday periods because the scammers realise that people aren't around to stop the rogue ads. Forums, and particularly football forums tend to get much lower ad rates than most sites, so obviously its cheaper for the scammers to get ads on sites like these.