I was watching for a while today and there doesn't appear to be anything very solitary about them. Most of them, a regular stream, are queuing up to enter the same hole and they look a lot like honey bees to me. black with a fringe of dark yellow at the back and faint striping of the thorax. Don't look much like the ones in Mandy's link...Is there another sight I could compare them on?

Still I'm sure your right...must go on a bee course.

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Paul