Look like bumblebees to me. Had a nest of them under my old shed which i have now demolished and built a new one over.

I didnt know they were there, but anyhow I had to get rid of them.

Got some newspaper set it alight, waved it about to create smoke and waved it where the bees were. They were all gone by dusk. Unfortunatly the nest was active and alot of eggs had been left behind.