I'm in the process of buying a house, it's on a new build site, there were traces of Japanese Knotweed, so a company was brought in to deal with it during construction. It was "Japanese Knotweed Limited" saw them on the BBC, appeared to do a really good job.
Currently awaiting my home buyers survey results, I did ask to check for Japanese Knotweed, but decided to take some photos of the side of the house, and post up. Just to set my mind at rest.
None of the below looks like it to me, the leaves should be heart shaped, the stems are very, very solid, but as far as I can see these are just your "average" plants.
Any thoughts, very welcome.