Thanks, Martin, that's a kind offer. From memory, when I tried to grow Welsh Poppies in the past I planted the seeds direct into the bed on the basis that poppies don't like to be disturbed. But I got very few (possibly no) plants, certainly not enough to sustain the population next year. I imagine I would need to start with a lot of seed (more than you find in a typical packet) in order to establish a 'critical mass' that would then go on to self-set.