- Site under complete redevelopment} Welcome to the Internet home of the Union of Greek Students in London ( SEFL , from its Greek name), a major independent, voluntary, non-profit youth organisation, promoting the interests of the 35, 000 Greek students and Hellas (Greece) itself in the UK. Britain (Freedom2Surf) Hellas (Hellas on Line) USA (HR-Net) To learn more about SEFL , please check this web ...www.sefl.org.uk