ID help needed! unknown invasive garden plant

ID help needed! unknown invasive garden plant

Observation - ID help needed! unknown invasive garden plant. Description: Help! This really aggressively spreading plant appeared in flowerbeds approx. 2 years ago but is now spreading under garden turf and patio. Am no epxert gardener but doesn't appear to be a 'classic' knotweed or bindweed. Or is it? Any info gratefull

Help! This really aggressively spreading plant appeared in flowerbeds approx. 2 years ago but is now spreading under garden turf and patio.

Am no epxert gardener but doesn't appear to be a 'classic' knotweed or bindweed. Or is it?

Any info gratefully accepted!