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The male has a tail that looks like a scorpion (hence the name of course). there are, I think, three species in the UK, really hard to tell apart...
With a reasonable photo from above, males are actually quite easy to tell apart.
All three species fly together at sites local to me.
My Flickr photos...
Lat/Lng: 56.9796, -2.2712
OS grid ref: NO836876