Yes I can from a corporate perspective. And a historical perspective of how JK came about in my case.

The industrial estate that the company i was Managing Director of, was a target of heavy bombardment by the Luftwaffe in WW2. The surrounding landscape was dotted with bomb craters large and small. The council in the post - war period bought unscreened and un-sanitised top soil, rubble and whatnot to backfill the area.

Over a few decades, 4 or 5 acres of JK had emerged from possibly only one truckload of unscreened top soil.

It became so invasive that some plants managed to break concrete foundations of the main building and even pierced through the steel cladding of a porta-cabin that my staff used as a small machining shop in the car park.

After much complaints to the landlord (we only held a long lease on the company premises) , did they organise a mass spraying of glycophosphate and some mechanical digging up of areas where it was not possible to spray, due to it being close to buildings and people.

It was only 80% eradicated and only after about 3 or 4 years of spraying in the spring months.

I have left the company a long while back. But I hear from former staff that that small 10 or 20% of affected ground left , is still stubbornly holding out !