Saw one yesterday fighting on the ground with a bee from a colony that had swarming bees returning by the 100's/1000's, the wasp and bee rolled around a bit then the wasp went away.
They might be later this year, probably Autumn.
Had one disappear down between two frames the other day don't know how it would of faired didn't see it again.
A few around but not many more bloody flys...