Sue or maybe it was Martyn from Green Lane Allotments asked me if I know the name of the Iris in the picture below.
Well if i remember right its called Katharine Hodgkin and we got it from Bloms Bulbs about 3 years ago. I've included a link to their website below where you will see they have several varieties of dwarf Iris. You actually treat them more as you would a bulb than a normal Iris as all their foliage dies down in a few weeks and there is nothing to be seen of them until next February/March time.
Bloms Bulbs (Dwarf Iris) .