Well I went there again to see if it would happen and it did. Again no other normal sites ever do this at all. There is a delay in rendering the page as if it has been redirected elsewhere and only happens once per visit. Maybe there is some vulnerability on my router that is linked to the Dahon site somehow. This time the page was actually quite tame and this is what I got. It looks ok to post to me being only cartoons and clothed but apologies if it causes anyone any offence. Wish I knew how to work out the referral string maybe that would reveal where its coming from.