I got this bulb some 10 years ago - and sorry for the rather nondescript picture, but it's all I have. It was growing by the pool side in a leisure centre in Swindon, UK, and seemed to thrive. It was growing in what was probably whatever was the standard compost at the time, something with sphagnum peat and perlite, I guess. The bulbs were of a similar size as a medium sized onion, perhaps 5cm across, the flowers were white, large and strongly vanilla scented. I was given 3 of the 'baby' bulbs, but they have slowly deteriorated, and I now have just the one, which is now about 1.5 cm across. It grows for a few weeks, looking healthy, but then the top dries up and it goes dormant until next May.
I'd like to get it back in health. But first, any idea what it is?