Thanks Pete. Could you tell me a bit more about the wing tip diffusion difference between the two skippers as I'm finding that I need something other than antenna & sex brands for pictures like the one above and this one (same time and place - Old Winchester Hill July 27th). It looks the same as...

Any ideas on my skipper?

My test effort might fail too but if I crash and burn will someone set me straight.
I'm going with upload attachment. I assume that the square bracket img bit is only for images on web pages?
Here goes ...