This was seen growing, apparently spontaneously, at the edge of a garden
access road. My best guess is sneezewort (Achillea ptarmica), but it
doesn't seem quite right - the habit is too compact, and the leaves too
short. Any other offers.

http://www.stewart.hinsley.me.uk/Images/Compos06.jpg

The other leaves in the photograph are Solanum nigrum.
--
Stewart Robert Hinsley