Cuckoo bee

Cuckoo bee

Observation - Cuckoo bee. Description: Masses of these around today trying to get warm. I've never confidently ID'd one of these to species, but this is maybe my clearest shot of one (too cool to buzz off...) so if anyone can help, please do!

Masses of these around today trying to get warm. I've never confidently ID'd one of these to species, but this is maybe my clearest shot of one (too cool to buzz off...) so if anyone can help, please do!