Sticky Willy and cleavers are one and the same. It's shallow rooted and easy to pull up. I could understand it if the housing association was concerned about the garden being overgrown with weeds. Maybe they're mixing up weeds with weed .
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Thanks you all, It really does look like rosebay willowherb, so thanks again! And this patch grows back like mad as it was only last cut back on the 29/ March, and when the investigation is over it will be time to dig them roots out.
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I've always called cleavers sticky willy. I didn't know it by any other name till I was quite old! Easy to pull out though.
I live in west central Scotland - not where that photo is...
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
I call it "bollock weed" on account of the seeds.