I have seen a spammy ad. Why do these appear and what can I do?

We use a third party network to deliver some of the advertising banners on our website. Together with the ad network we agree the types of ads we would like to see and would like to avoid on our webpages. Most of the time, we are happy with the type of ads that are shown, but occasionally inappropriate ads do get served by the ad network's systems, despite the filters that are put in place. This is rare but when we are alerted to such ads we contact the network, ask them to remove the ads and make sure they do not get shown again. Contact us to tell us about the ad you have seen.