Unknown butterfly / moth

Unknown butterfly / moth

Observation - Unknown butterfly / moth - UK and Ireland. Description: 3cm wide (wing tip to wing tip) Mottled brown Long body (with tail?? Moth or butterfly? Fast wing beat (moth-like) Wings shaped more like a butterfly On Buddleia.

3cm wide (wing tip to wing tip)
Mottled brown
Long body (with tail??
Moth or butterfly?
Fast wing beat (moth-like)
Wings shaped more like a butterfly
On Buddleia.