Usual means of propagating this plant is by division of the rhizomes in spring, can't find any info about growing from seed, Pamg. I doubt your plant is actually dead - should be indoors for the winter, so treat as a houseplant and it should revive.
Ignore that, done a bit of research - it should be dormant between autumn and winter, needs to be kept at 10-15 deg C during that time. Starts into growth next spring, or should do...

thanks Bamboo , I'll look after the plant as you say---but I can't resist planting the seed so maybe as ive 3 seed heads i'll do both ways!!

Yep, why not, though probably best attempted in Spring, I think.

I think you are probably right-- last year I got Magnolia seed to germinate and have some cordyline in now but these being from warmer climes may need all the heat they can get!