Roy,
There are some filters available - we put two new ones in place this morning. We expect these will have some effect, but unfortunately they won't catch all the posters and postings.
There seems to have been a sharp increase in unwanted postings lately - why, we don't know. However, there are three of us watching the forum 24 hours a day and we'll continue to try and remove any unpleasant material as quickly as possible.
Dave