[Grangar]

Could it have been a Mammoth Wasp?[1] I've seen one in the Netherlands 2 years ago. Very distinctive pattern on the abdomen.

1: https://en.wikipedia.org/wiki/Mammoth_wasp

[willvarfar]

Yes! Now I definitely have to check the next one I see or find! It really could be this monster! Will try to get footage of them overpowering then releasing bees.

Only problem is how to share my findings in a month or two when they are active!?

[throwanem]

Would a mammoth wasp attack a bee? Scoliids are parasitoids, and this one is described as having a life habit typical of the family. Typically the adults feed only on nectar, unlike the more predatory vespids.

[willvarfar]

The markings feel familiar. Of course I am not being objective and need to actually get one in front of me to check when they are in season.