Underside of Wasp/Hornet?

 Underside of Wasp/Hornet?

Observation - Underside of Wasp/Hornet? - UK and Ireland. Description: Taken through glass - it was clinging to the outside of the window. About 20mm long. Not sure if it may have been a large hoverfly?

Taken through glass - it was clinging to the outside of the window. About 20mm long. Not sure if it may have been a large hoverfly?