Found a cluster of these on a neighbouring verge. Looks a lot like sow thistle, but with prickly leaves.
Sonchus asper (sharp-fringed sow thistle, prickly sow thistle, spiny sow thistle, or spiny-leaved sow thistle) is an annual plant with spiny leaves and yellow flowers resembling those of the dandelion. The leaves are bluish-green, simple, lanceolate, with wavy and sometimes lobed margins, covered in spines on both the margins and beneath. The base of the leaf surrounds the stem. Its edible leaves make a palatable and nutritious leaf vegetable. The plant is classified as a noxious weed in some places, but not others. (Wikipedia)