There are lots here in Kent too. I found a patch in a local lane that looked so beautiful I took a photo. If they weren't such thugs, we'd prize them. If they don't clash with my colour schemes I let them flower but try to deadhead. I also let other wild plants flower, like cow parsley, herb robert and red dead nettle, which lots of insects love. Early in the year there's not much else for them to feed on. I just pull them out when they look tatty. I don't even mind seeds on the compost heap because if they germinate I can hoe or pull them and leave them to feed the soil and provide a bit of mulch. It works for me. I also eat plants like bittercress and ground elder, though I'd happily get rid of the ground elder.