One hears lots of horror stories about Japanese knotweed damaging property, but I have to say in 20 years of being in this game I've never seen anything as spectacular as this photo.
Invasive Weed Blog
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It's taken many years for the insurance market to wake up to the problem of Japanese knotweed. A few years ago you couldn't get any cover for Japanese knotweed, the risk remaining fair and square with the property owner, to pay for the costs of treatment, for any claims made against them from aggrieved neighbours being the victims of encroachment, and for repairs to damage caused to property.
If your company has incurred costs in remediating land affected by Japanese knotweed you may be able to claim substantial sums of tax back from HMRC.