I was out for a walk the other day and my dad spotted some Japanese knotweed growing out from a hedge into the road. i reported it, and have just had this response:
"It's down to landowners to control any Japanese knotweed on their land, but they do not have to remove it as the natural growth and spread is not illegal. However, allowing the Japanese knotweed to spread onto land outside of the ownership or control of the landowner can be seen as an offence.
However, offences are not reportable to the Environment Agency. Such offences should be reported to the wildlife liaison officer within your local police force.
There is further information on Japanese Knotweed online."
I would have thought they could just pass on the specific location (which I gave them) to the council or something, at the very least. But no, not our job, it's not an offense, mind your own business and let a passing lorry or wide load transport it around the country. Sterling work chaps.