Can anyone help identify this UK bee? The picture was taken in June 2016.
Doesn't have to be exact, really just want to know if it's a honey bee or a solitary bee.
I am sure it’s not a honey bee – the eyes are different. It could be a solitary bee of the genus Colletes. According to Wikipedia, their nests
... are lined with a cellophane-like plastic secretion, a true polyester, earning them the nickname polyester bees.
It is indeed not a honey bee, but I don't think it belonges to the genus Colletes. They have a striped, not hairy body. The bee shown seems to have stripes but these are hair bands. I think this is a Mason bee, Osmia rufa (=bicornis). Osmia rufa is one of the most common bees in Northwestern Europe.
Osmia rufa uses holes to lay eggs with some pollen and then closes the hole, usually with clay or loam, hence the name Mason bee. It is probably looking for nesting space. But they live solitary so every nest will give only a handfull of bees next year. They are completely harmless, will not defend their nest. I have them in my garden a lot. Don't worry but enjoy them!