My 2 year old daughter spotted lots of these small, fuzzy orange bees on the newly dug soil in the garden. I identified them (by text message, having been sent the iPhone picture above at work) as Tawny mining bees. These are solitary bees, only about a centimetre long, that burrow in soil and raise their young underground. They are only to be seen March to May, hibernating the rest of the year in their tunnels. Completely harmless, I find them rather charming and it's fascinating the way many of them will suddenly descend on a small patch of soil to set up home - which is what my daughter witnessed.