Small Bouquet

I've looked and looked for this tiny flower, once again I neglected to take any shots of the stem or leaves (how helpful eh?).
These tiny flowers are about 5-7mm and tubular, this plant looks really similar to the Cuckoo or Milkmaid plant but much smaller, and white.

Any help with ID would be great :)

Update: Thanks so much to my good friend 'Down the Road of Life' for the ID of Bittercress on this one.