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Hi How can I help?
Firstly sorry to hear about your situation and that the sell has not gone through.
An owner or occupier of land is not obliged to control, remove or treat Japanese knotweed on their land. They can be liable, however, should they allow the knotweed to spread onto neighbouring land. You can use the surveyor report for this.
You could then issue private nuisance proceedings in the Civil Courts for:
Even if the knotweed does not spread, there may still be liability for the diminution in value of the neighbour’s land for the knotweed simply being in the vicinity.
In addition, Local Authorities have the power to serve notice on an occupier of land containing knotweed. This notice can require them, within a set period, to remedy any knotweed which could adversely affect the amenity of an area. Failure to abide by this or to properly dispose of the knotweed (such as discarding it in the wild) can lead to criminal liabilities.
I would strongly suggest you take this up with your local first!