saffron crocus failing?

I've got 60 bulbs of saffron crocus in my back garden in pots with a gravel top layer. foliage is plentyful and they look in great condition. the problem I'm having is flowering.  I had about 10-15 flowers early december then I persume it became too cold, but should they not be flowering again now? Has anybody had a similar problem? Or can anybody offer some advice or info about what is going on?

Thank you kindly in advance.

Extra info. Bulbs purchesed from suttons.

True saffron crocus flower in the late autumn. They will start to die down about now and will be dormant during the spring and summer and should be kept fairly dry, then in the late summer/early autumn start watering and they will form new buds and flower late autumn.

my crocus have not flowered but I have leaves that's all.

Flowering rose, are we talking Saffron crocus here?  If so the weather last year may not have helped - they need a dry summer .  Or it may be that the corms may have been a little immature.  Try to let them dry off over the summer and hopefully they'll spring into life next autumn  

I've never succeeded with these. I lived in Saffron Walden for years, where it was grown on a commercial scale in the past, but still couldn't keep it. 

I think summers were warmer and drier back then   If I were going to grow it in the UK I'd look for a free-draining south-facing slope.