Tiggrx has identified this: This is Gomphocarpus fruticosus (Bristle-fruited Silkweed) a member of the Milkweed family native to South Africa. It is naturalised throughout the Mediterranean region.
Thanks. I'll be putting up some Basque plants when I get the time - shall appreciate comments ....
"We are on Earth to do good to others.
What the others are here for, I don't know."