I think they are miner bees?
Do I kill or leave them be…
Miner Bees unlike honey bees are more solitary, less socialised, shun unions and are naturally predisposed to haemophilia. If you want to get rid of them play recordings of Arthur Scargill speeches close to where they are digging burrows.
Any union honey bees in the locality will swarm to the location and set up a picket line. The miner bees will have no hesitation in crossing this, but the honey bees will just kick off – hurling abuse, brick, bottles. When struck by any of these missiles the haemophiliac Miner Bee will tragically bleed to death while all the surrounding union Honey Bees, unaware off the irony, shout ‘Scab! Scab! Scab!’