Tapered drone fly, Eristalis pertinax

Eristalis pertinax tends to be the earliest Lagoon-dwelling hoverfly in the season that you will see, along with Myathropa florea. They often hover in one spot in the air, behaving territorially, and mate-searching. As their name suggests, they have a tapered abdomen, different to E. tenax, and lighter-coloured, yellow middle and front feet.

Eristalis pertinax female showing yellow feet and face
Eristalis pertinax female showing tapered abdomen and yellow feet
E. pertinax ovipositing ~200 eggs in a seed tray Lagoon, filled with freshly fallen plum tree leaf litter. She continued to lay eggs after I caught her, which I did to confirm ID.