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Looks like himalayan balsam to me.
Wait for a second opinion but if conformed I'd take it out. It's enormous, seeds everywhere and swamps everything else
Verbascum lychnitis looks pretty much like that as well
It points towards the sun so may not have been facing you at a different time of day. But it doesn't flower for long
I can't really see the flower shape but If it's a pea it might be grass vetchling, Lathyrus nissolia.
Possibly Atriplex hortensis or similar
I never bother to remove anything for that sort of sowing Fleurisa. It doesn't happen in nature.
If I'm collecting and storing any seeds I just keep the seed.
I understand now. Might take a bit more than a week but I see where you are
It often appears in pots of peat based compost
I think it's Juncus effusis