What is this plant?

It's about as tall as a cup of water. It's growing between the tiles in my balcony.
It seems to have tiny berries in a couple of places.
I have no idea if it's just a weed, a fruit bush, a tree?...
I need to remove it from the balcony but depending on what it is I'll either throw it away or try to move it to a vase.
Thanks in advance

(Oh and I live in the UK, if that helps)
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I would pull it out and dispose of it before it produces its own seeds.
😊
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.