The recent £6m fire has shown this to be the case beyond doubt. I can remember arguing (what, me?) with a manufacturer about 6 years ago that these things were dangerous and should be banned and not getting a great deal of support. I doubt whether that would be the case today.
http://www.bbc.co.uk/news/uk-england...ngham-23208758
Good on Poundland. Time these things were banned completely.