Wasp(?) with Gold Waistcoat

Wasp(?) with Gold Waistcoat

Observation - Wasp(?) with Gold Waistcoat. Description: Long narrow dark wasp/fly, about 12-15mm length, in staffordshire kitchen, then settled on outside of window. Camera wouldn't focus due to glass - sorry. Bug eyes with slight green irredescence. Gold waistcoated thorax, a larger area is gold than the p

Long narrow dark wasp/fly, about 12-15mm length, in staffordshire kitchen, then settled on outside of window.
Camera wouldn't focus due to glass - sorry.
Bug eyes with slight green irredescence.
Gold waistcoated thorax, a larger area is gold than the photo suggests.