Nemotelus pantherinus

Whilst walking back to the car I saw a couple of groups of flies over the saltmarsh so decided to investigate. One land on some grass allowing photos. I netted another to bring home in case the photos were inconclusive. I managed to track down to the Stratiomyidae family. Being a distinctive fly it didn't take too long to find out which one it was. Fortunately there aren't any identical flies that I can see so the one in the pot can go.

Nemotelus pantherinus