English a minority language for 40 percent of London schoolchildren

EPSRC funded study points to rich diversity of language in London's schoolchildren with over 40 different languages found.  The research also associated high achievement with specific languages, including Yoruba (Niger-Congo) and Igbo (Nigeria).

http://www.esrc.ac.uk/news-and-events/press-releases/20633/language-diversity-will-make-london-a-true-global-player.aspx