The mystery of the poppy is now solved as you can see. I had hoped it might have been 'Black Peony' but that was not to be, as the poppies have turned out to be the common or garden purple variety.
They are still beautiful in their own way, with the crinkled, ruffled silky petals and the dark purple patterns at the centre. One other benefit is that being single flowers, they will be more attractive to bees. I can't really complain as they were totally free!