Alkanet, the little white spots on the leaves give it away -
it has an effective blue flower and is used as a border plant
but self seeds like mad and I am not that fond of it.
If you like it just make sure you dead head it before it goes to seed!
The humble nettle!
Cleaver, the dogs bring endless burrs into the garden, but they are easy enough to pull up if you get 'em young
A baby dock, with a mega tap root hiding below..
Ground Elder, those darn Romans brought it over to cure gout!