Posted: 05/10/2015 at 07:39
Cc120, make sure you take photos - so when it spreads you can prove where it started.
i found some several years ago at the bottom of my garden and rang the council for advice. They said not to panic, it's not as bad as all the press. They'd said to cut it back and burn and then to treat regrowth in the spring. They did the treatment for me by injection for £75. Then I used round up on regrowth after that.
Personally, I'd chase up the housing association - they'd should be able to get the professional to deal with it. However you don't want it to encroach on you in the meantime. I have noticed though that it seems to get more vigorous when attacked.