To me it looks like Scilla cilicica. Or possibly one of the species that have now been included in Fessia, greilhuberi and hohenhakeri. I'm not enough of a botanist to tell these three apart, but they all have the swept back petals and extruded stamens. One of the three, which came to me as greilhuberi, is now a weed in parts of my garden. Both S. cilicica and S. greilhuberi are shown in my account of the Loughborough Show.