Ryuji Takayama: This kind of thing... it doesn't start by one person telling a story. It's more like everyone's fear just takes on a life of its own.
Brockley has a Japanese Knotweed infection. Japanese Knotweed is the most invasive species of plant in Britain and needs to be removed by specialists if you have some. Happy in pretty much any soil or puddles of dark water, its roots can cut through concrete foundations or meat and bone easily.
One reader reports that it has spread to several gardens between Braxfield and Arabin Roads.
If you have some, you should consider getting rid of it as soon as possible, since it grows at up to 10cm a day. Thanks for the effort.