Unidentified bee

Unidentified bee

Observation - Unidentified bee - UK and Ireland. Description: Several small bees have been burrowing into a dead sallow log in a window box in our garden. While trying to photograph them this one landed on my finger and I got a quick snapshot. Any suggestions as to its identity would be welcome.

Several small bees have been burrowing into a dead sallow log in a window box in our garden. While trying to photograph them this one landed on my finger and I got a quick snapshot. Any suggestions as to its identity would be welcome.