Wasp? for id

[Lesinlondon]

Saw several of these wasps? flying around an old dead wood stump. They would occasionally land with some entering tiny holes they (or other sp.) had dug. Difficult to get a shot, but was lucky to see this pair mating, and another exiting a hole. Looking for id or suggestion if anyone can help. Thanks, Les.

[eucera]

These are the bee Chelostoma campanularum, a specialist bee that visits, would you believe it, Campanula flowers

[Lesinlondon]

That's great, thanks. A bee, I have often seen them around this spot but never managed to get a picture as they land only briefly. Today I stayed and watched and got lucky. Les.