IMG_0496 Any ideas as to what this plant is please?

IMG_0496 Any ideas as to what this plant is please?

Observation - IMG_0496 Any ideas as to what this plant is please? - UK and Ireland. Description: Small round heads on long, bushy, leafy clump of stems. Leaves appear opposite, pinnatifid.

Small round heads on long, bushy, leafy clump of stems. Leaves appear opposite, pinnatifid.