Stewart Robert Hinsley writes
In message , K
writes
Stewart Robert Hinsley writes

Valerian has flattish flower heads; Mike's plants seem to have spikes
of flowers. It might be some kind of mullein, but I think we need a
photograph of a single plant for identification.

Leaves are wrong for valerian = Centranthus ruber - valerian leaves
are a bit more erect, and on branches, rather than one stem per plant
here.

I was considering the possibility of other species of Valerian, tho'
none of V. officinalis, V. dioica and V. phu look like a match.

I'd dismissed V officinalis because of the segmented leaves, I don't
know the other two.
--
Kay