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David - I agree with Armin & I don't think your plant is C. cartwrightianus - the yellow throat is not correct. It's difficult to tell whether the anthers on your plant are yellow or cream. Although all the saffron crocuses are said to have yellow anthers, I have a C. cartwrightianus in which the anthers are cream. Maybe yours is a form of C. thomasii which turned up in my garden from seed I received as C. cartwrightianus.
Sorry Hagan the link was for David. I was too quick to to hit post.I think David's cartwrightianus is the lilac hadriaticus but I'm willing to be shot down
David - although I think your plant is more likely to be C. thomasii than a lilac C. hadriaticus you will need a hand lens to try & confirm this. If you have such a device, I can let you have the details from Brian Mathew.