Wasp with long ovipositor?

Wasp with long ovipositor?

Observation - Wasp with long ovipositor? - UK and Ireland. Description: About 2mm (last picture gives an idea of the size). Looking at the shape of the abdomen I'm not eve

About 2mm (last picture gives an idea of the size). Looking at the shape of the abdomen I'm not even sure it's a wasp. Any suggestions would be most welcome - thanks.