The opium poppy is papaver somniferum - it's also the ornamental poppy gardeners grow & the poppy grown for industrial use (poppy seed oil etc) - same beast, only becomes an opium poppy when you score the seed head I suppose. Comes in a variety of colours from white to pink to red to purple.
The poppies you get growing wild in hedgerows are more likely to be Papaver Rhoeus, the corn or field poppy, but that contains morphine & other opiates, so it could be considered an opium poppy too.