I've moved areas now
But wrote to a London MP about the problem a few years ago. I know him quite well, or I did, so I know he was using the politest terms possible but I think he thought I was just being silly.
It's probably worth another try now. Your post has actually made me realise that I wrote to him in a time where things were much better, but we still had loads of problems with antisocial adults letting them off in the street. I saw buses trying to swerve them and so on, neighbours had them through a letterbox.
But yeah, things are so much worse. It might be another try.
Fortunately, where I live now, it's not really an issue so it seems a bit pointless for me to write to this MP?