I am, unsurprisingly a member of the British Iris society and every year there is a seed distribution. A LONG list of seeds that have come from breeders, nurseries, individuals and just about anywhere really all collected by Mrs Criddle and her assistant and then sorted out and offered to other enthusiasts. MTB seeds are always quite rare and gone fast but this year I managed to secure a batch with a promise to send lots of 'pods' from our plants in early September.
Last year I grew all the seeds we got from our MTB patch, this year I will need to be a bit more circumspect, space is an issue already and will only get worse as we add more and more cultivars.
Selectivity I think and Mrs C will no doubt be happy with an influx of MTB seeds.