Bindweed or Japanese Knotweed
Just moved to Kent this month. Suddenly vine like plants appearing in bare earth. Area is about 20' x 10.' Obviously, previous owner tried to eradicate. Some stems appearing in grass too. Also in next door garden. Very worried this could be Japanese Knotweed.
I have to admit - it does look a lot like japanese knotweed. Here is an article on japanese knotweed control that will help you: