Google says it will stop advertisements for expensive unofficial Electronic System for Travel Authorization (ESTA) services appearing at the top of search results – eight years after the first complaints. According to a BBC News investigation, unofficial sites charging five times as much as the US government flooded the top of Google’s search results. The official ESTA web site is run by the US Department for Homeland Security. It charges $14 (£10.70) for each ESTA application. Some unofficial sites charged more than $80 for an ESTA application.