There are interesting posts in the lis-infoliteracy discussion list and on Moira Bent's information literacy blog, sparked by a BBC story which covered a survey carried out by a teachers' union, the Association of Teachers and Lecturers (there were 278 respondents, teaching sixth-formers in England, Wales and Northern Ireland).
BBC. (2008) "Teachers voice plagiarism fears." BBC news. 18 January. http://news.bbc.co.uk/1/hi/education/7194772.stm
There's a bit more information, including responses to the key questions, on the ATL site at http://www.atl.org.uk/atl_en/news/
Photo by Sheila Webber: Old man's beard in sunlight, Lewes, December 2004.