While it's definitely a poppy, it's hard to tell from the flower whether it's a
perennial oriental or opium variety.
Are the leaves and stems bluey-green and hairless? If so, it's probably an opium poppy.
If the leaves and stems are hairy and dark green it's probably an oriental, which isn't narcotic as far as I know.
Chris Sturgeon wrote: you can cut small slits in the sides of the pod and "milk" the flower. ...Do be careful
Be careful in more ways than one: it's illegal to '
milk' opium poppies in my neck of the woods...
I don't care about legality, but I know having opium poppies in view of passersby can be a bad idea as I had all the poppy flower
buds in my front garden snapped off.
I have orientals out the front that haven't bloomed yet and considering the early demise of my opium poppy buds, they probably need to go round the back!
*edit* Just spotted the leaves: it's an oriental. Beautiful, perennial, insects love them and no use for back pain