We have ONE flower on the Wisteria Plant!

After 5 years of waiting patiently as the Wisteria plant has overgrown the front of our house (picture on RHS) we now have ONE bloom!  Amazing - will it be another 5 years until we get two?  For those gardening enthusiasts please don't give me all that male/female stuff - nobody seems to know how it all works but I will be keeping a careful watch over the coming days and will keep my fellow blippers posted...