Okay, I've had another think.... and a good look at what I remembered was Thalia, flowering now, but which Ian and I now realise is 'Niveth'.... 'Thalia' isn't flowering yet here!
I tried to post these yesterday but the Forum was too slow, and it is almost as bad today. Apologies to you all, we are looking into the problem.
So, here are some pix of Narcissus 'Niveth'... let's see what clarity, if any, this brings to the situation!!