Downlooker Snipefly (Rhagio scolopaceus)

Downlooker Snipefly (Rhagio scolopaceus)

Observation - Downlooker Snipefly (Rhagio scolopaceus) - UK and Ireland. Description: A picture-winged fly of some sort. Can anyone help with an ID, please? (Does anyone know of a good resource for helping to ID these critters?) Edit: Changed to match Chris's ID. Many thanks.

A picture-winged fly of some sort. Can anyone help with an ID, please? (Does anyone know of a good resource for helping to ID these critters?)
Edit: Changed to match Chris's ID. Many thanks.