Hi Chris,
Thanks for the response, I've never even
heard of a dozen of your invasive species, and I must live nearly on your doorstep, Caversham in the Thames Valley.
Does the Enviroment Biodiversity Agency [ignorance is bliss, never heard of them either] have or send out warning packs on species to watch out for and report ?.
I did a "contact us" to The Enviroment Agency this year and only recieved an automated reply, which wasn't too helpfull, or encouraging, we thought we'd come across some giant hog weed, but after some googlng around, decided it was hemlock, [ I picked a piece to take home

and didn't break out in a rash].
Thanks,
Max.