They are euphorbias, Ruti - probably e.characias, sub.sp. 'Wulfenii'...or possibly e,amygdaloides var robbiae. Anyway, be very careful cutting them - if you get any of the latex-like sap on your skin, it will react with sunlight and can cause horrible blistering. Apart from that, they are a great architectural plant, beloved of wildlife and an absolute design stalwart. Looks fabulous with purple toadflax or nicotiana...anything purple, really.
Oh, sorry for the repetition - a whole slew of posts appeared whilst I wasn't noticing.