Not that I'm aware of, but I'm sure that there are examples of it. I have not—. That is a bio-control method I've not heard proposed before. I wasn't aware that Japanese knotweed was, in fact, edible. I suppose I should add the caveat, if anybody's watching this: do not try this at home until it's been fully tested. The leader of the house tells me it's quite horrible; I won't ask her whether that's personal experience or not, but it's not a recommendation from her. Edible but horrible—[Laughter.]—that is the Government line on the consumption of Japanese knotweed. 

There's an important point here: knotweed is an incredibly invasive species—easy to move around—and, of course, it's hugely important that there are new ways sought to control it, but also, of course, that any kind of illegality regarding its dumping is dealt with as quickly as possible.