You have two flowers fused at the ovary/receptacle. Some snowdrops, notably one called 'Mrs Thompson', do this sort of thing regularly although with variations on the theme.
Thanks for this info Alan. I had seen 2 flowered ones, but not the 2 fused flower versions. After a web search I've now managed to find a couple of pic's. I see she is a hybrid. So being G. woronowii, this would be a new clone. Just need to wait a few years now to see if it's ever repeats this.
