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Thanks for your question. You would be held responsible if the neighbours had evidence that the infestation came from your land. I have had quite a lot of experience with selling and buying properties with JK. As a purchaser you have to ensure that the seller gets, or allows you to get a survey from a JK specialist. That survey should say whether it has spread to neighbouring properties. You want to make it a condition of contract that the seller takes steps to eradicate all of it and it’s sources and that a 10 year Guarantee is available from the contractor.
You’re welcome. Don’t forget to leave a positive rating on the system so that I am credited for my time. Note that you might also want to get a JK indemnity policy from some like Countrywide Indemnities to supplement the guarantee from the contractor.