When I moved into my house a few years ago, the lawn was tatty and thin, but not dreadful. That summer, next door did a big garden makeover. They put in a big tree which is huge now and overshadows my garden almost completely and I've now got a huge bald patch on my lawn, presumably due to roots taking water from the grass. But my biggest issue is these bastards arrived! (Am uploading pic...) Huge green weeds with very long, white carrot like roots and blue flowers. They are EVERYWHERE and I cannot seem to eradicate them. I've had a company in to put killer stuff, I weed, I try not to mow until I've weeded so as not to chop roots and spread. But one nice day and boom! 3 foot high and spreading. Does anyone have any ideas, please?!