Orange coloured fly

Orange coloured fly

Observation - Orange coloured fly - UK and Ireland. Description: I have seen these orange coloured 'flies' in several wooded areas around Dorset but cannot find anything that comes near to it. Indeed, is it a fly - possibly a saw-fly?

I have seen these orange coloured 'flies' in several wooded areas around Dorset but cannot find anything that comes near to it. Indeed, is it a fly - possibly a saw-fly?