I'll have to do more research, but my gardening companion (who studied pollination biology) suggests that the cooler climate here in England would favor more bumblebees, who can fly at lower temperatures, relative to butterflies and other insects. I have seen a few wasp-like flower visitors, but primarily a remarkable array (to me) of bumblebees, in addition to honeybees.Regardless, I've been having a field day observing and taking pictures of them!
