@fidgetbones, forgot to say, yes, East Anglia. Could potentially have been seeded (it's in a work place), but nearby there is nothing that suggests anything exotic, rather lots of weeds typical for verges (dock, herb robert, ground ivy et cetera).
Fab, thanks @Papi Jo ! Interesting plant, think I will give it a try in my "tapestry lawn" project - it's not unlike a verge actually, just excluding the rampant weeds.
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