other Sawflies and suspected Sawflies

Sawfly are included with Wasps rather than Flies since they are of the "Hymenoptera" order (Bees, Wasps and Ants) with four wings.
They are stockier than most wasps, with little waist between thorax and abdomen and have caterpillar-like larvae. Females have a serrated "saw-like" ovipositor to cut plants/leaves.

The Arge ustulata Sawfly has a distinctive dark spot on each forewing and an orangey base/leading edge of wing moving to clear wingtips (with veins). The body is dark metallic and broad. Legs are pale orange with black. It flies May-July through most of UK. Larvae feed on willow, birch and hawthorn.

This insect, attracted to light at night, is suspected to be the Green Sawfly Rhogogaster viridis.

Or this sawfly may be the Green Sawfly, Rhogogaster viridis, or may be the Green-legged Sawfly, Tenthredo mesomelas

Also thought to be a sawfly

And another

Don't know what this squat, four-winged fly with thick waist and waspish antennae is, but it may be a Sawfly.

The four wings.

The underside.