Well, any case in which this happened is obviously a bad thing. Thats just not right.
I note that the source of the article is the Daily Mail though - a tabloid newspaper like The Sun (you know, the kind that has headlines that fill half the front page), just more rabidly rightwing still. So I'm taking this still with a grain of salt.
It would be useful to look up the cited study, funded by the Department for Education and Skills, to see what it says exactly, and what the scope of this is - an isolated case or two (also bad, but still, an isolated case or two) or something that is happening on a worrying scale.
Unfortunately, right now, I dont feel like doing research. Sorry