Probably a miner

I keep trying to see, and to recognise, bees other than the usual bumblebees and, nowadays, honey bees.

Today, in the blackberry flowers, I saw this tiny thing face and eyes into the sweet parts of the flower. Methought, p'raps a bee!

And, I am told (on a local Insects page), it is a mining bee.

It's tiny: not as long as the width of your little fingernail, maybe seven or eight mm.