I bought a pack of Dierama seeds from Lullingstone World Garden, Tom Hart d**e said they would germinate like cress and they pretty much have in a seed tray outside the greenhouse.
I sowed a pack of Echium Pinnana which I bought from the T & M Seed sale in the spring, nurtured them in a hot greenhouse and nothing but yesterday, 6 months after sowing I noticed 6 little seedlings!