If yours is anything like mine then the corms are so deep that digging them out would be a major mining job.
If you can save and sow seeds, they usually produce plants of much the same colour as the original, but not always and you never know you may get a few different ones.
Otherwise best time is when the plant is dormant.

Thank you. I'll try it some seeds :)

I have some small plants of a deepish redy pink if you'd like some Hywel? should flower next year hopefully.

A kind goyer sent me a young one few years ago and it grew on with no problems Wish I'd known you'd like some seeds but its maybe the same pink as yours.

Thanks for all your comments :)

Never mind Sue, I never thought of trying the seeds myself but I'll sow some this year.

Seaburngirl I've sent you a PM