a fly? a bee?

a fly? a bee?

Observation - a fly? a bee? - UK and Ireland. Description: it was quite big - about 4cm,it seemed very sluggish so probably not in the best if health - someone sugessted it was a type of female bee?

it was quite big - about 4cm,it seemed very sluggish so probably not in the best if health - someone sugessted it was a type of female bee?