Spring or Autumn?

It’s a beautiful day on the Mount. The season is turning and we are approaching the delight which is autumn up here. However, I have this potted plant which I haven’t been able to identify. I have scoured the Plant Encyclopaedia, maybe just looking in the wrong place. It seems like a spring plant not an autumnal one.

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It can’t be a crocus as it doesn’t die back. I thought it was an orchid when I bought it pot-bound at a garage sale in early summer. I repotted it and forgot about it. Now it has this lovely creamy white flower.

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Maybe my little white cat knows what it is!

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Any suggestions welcome.