It's only a "weed" if you want it to be. I'm not sure what. it's a nice looking plant. It looks like it's about to flower. I would leave it for now.

very true!

Phlox possibly?

Several things it could be. Another photo when it flowers will solve it.

my first thought was phlox too.

thanks all i'll have a look at phlox

Has this just appeared in your garden or have you just cone across something already established? Is it shrubby at all?

I quite like the look of the fleshy glossy leaves :)