Mysterious Amaryllis

When we got back from Harrogate this Amaryllis had shot up.  It is a mystery to us because of its colour.  We have red Amaryllis that belonged to my parents and over the years have produced regular flowers and offshoot bulbs.

I have no recollection of ever having bought or been given a pink/white version.  This bulb is clearly a young bulb only a couple of inches in diameter.  Logically this is its first flowering.   But where did we get it?  I have no idea.