The Essex International Jamboree with amateur radio station GB2EIJ takes place near Chelmsford in Essex August 18-25 and they will also have their own broadcast station.
GB2EIJ will be on the air on most bands using SSB as well as the Data Modes. They hope to be able to use Echolink (look for G7BIV with GB2EIJ in the title).
Broadcast station Jam FM 107.2 is the special Guiding and Scouting Jamboree station that will broadcast from the Essex International Jamboree site. As well as 107.2 MHz the station will also be broadcasting online, see http://www.eij.org.uk/media/jam-fm
Essex International Jamboree Moves To Chelmsford - http://skreenspark.org.uk/news/articles.php?storyid=9h1Buw