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Mark - I think that it could well be C kosaninii. Usually quite small, few leaves, late flowering here and very easy to tell from C biflorus by the corm tunic which is fibrous rather than the papery annulate (rings at the base) tunic of C biflorus.
My C. kosaninii flowers as early as late August (February) or as late as October (April). Not sure what makes the difference year to year, perhaps dryness in the early part of the late years, if you see what I mean.
Mark, once the autumn species have started following some decent rain, (C. pulchellus is always the first), there's really no day when there isn't at least one crocus in flower until late October when C. minimus finishes. It's impossible to say whether some are autumn or winter flowering, and others winter or spring. The main season is late July (always our coldest month) and early August. While some species vary quite a lot in their timing, the order of flowering seems to be pretty much the same each year.