A rare sighting of a queen

We tend to find it really difficult to find the queens so we were really happy to see this one last weekend. Its meant to be easier to find them at this time of year because there are less bees in the hive and less frames of brood to check. It was even more unusual for us to also have the camera at the ready to capture this picture.  We did not dare mark her for fear of damaging her in the process; I think a good queen will be a valuable commodity this year.

Do you have trouble finding your queens?