Its a California poppy, Escholzia Californica. It sel seeds quite happily so you may have more nxt year. A very useful filler, and children love taking the little "nightcaps" off the opening buds!

Yp, Californian Poppy. It is perennial in warm places, annual here. It self seeds where it likes - normally well draining soil.

had a gorgeous display from these poppys this year,collected all the seeds going to make a nice feature in a large border next year.