Setting the referrer in .htaccess
 

I currently use the ErrorDocument condition to send my traffic elsewhere, but i want to be able to make sure my site is being passed on as the referrer when this happens - which doesn't seem to be the case at the moment. Is there a way of using ErrorDocument to redirect error traffic and set the referrer header as my site?

not really
the refferer is set by the browser not by the server.

Only chance to do this would be a 100% frame on your domain that opens the site - this way your ref is set.

google is your friend