This is one of the Wintercress family. Until I see the seedpods, I'm opting for Medium-flowered Wintercress.
I used to feed Chickweed to budgies, goldfish and tadpoles. Seemed to work.
It has been pointed out to me that this, however, is Sticky Mouse-ear, or Mouse-ear Chickweed. Good spot.
More early shoots. This time it's the Bird's-foot trefoil.