Permabanned
Yeah the neighbours garden is just a mass of weeds and well more weeds. I think he asked someone who works as some sort of gardener for a company called knightstone I think he said. I remember him having a conversation with someone, which I vaguely overheard but didn’t really pay attention, he told him it could be Jkw.Looks like the same stuff that keeps popping up in a few different spots in my garden coming from a neighbour who doesn't keep the garden under control and the alleyway behind. Grows hilariously quick which might be why the neighbour suspected knotweed? I believe it can so reproduce easily from cuttings so it can multiply if cut/dug up and not removed in full.
Anyhoo I’m a little bit more relaxed about it now and I’ve offered the neighbour the use of some Gallup 360 weed killer I have, which should pretty much kill everything he has growing.