What is this plant?

A plant with these leaves has appeared in one of my tubs of Hostas, and seems to want to dominate.
It is probably another common one that I do not know. I can do an overall pic if required.
Can anyone identify, please.
Thanks
Ferdinand


It is probably another common one that I do not know. I can do an overall pic if required.
Can anyone identify, please.
Thanks
Ferdinand


“Rivers know this ... we will get there in the end.”
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Immaculately quick responses - I will add a couple more in a minute.
Time to repot some hostas.