Newly emerged Fly - Silver coloured

I'm not going to attempt to ID this critter since it hasn't got its colour yet.

When I was trying to catch something else it caught my eye because it showed up on the green, but I just dismissed it when I realised that it wasn't very sharp. Later, I was trying to ID another fly when I came across an ID request about a silver fly and it talked about it being newly hatched and not having coloured up yet. That rang a bell in my head and I tracked down this shot.

Of course, it could be a 'robofly' :)