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If you had a photo showing the last abdomen segements from the side, but from a lower angle it would be easier to be 100% certain of the ID (Common Darter would show a visible vulval scale, Southern wouldn't).
With these photos I'm 99.99% certain that it is a Southern Darter though!
Aging darters can be tricky, but Southern Darters tend to keep the pale pterostigma that is seen in immatures of all species, + they have greatly reduced black markings on the side of the thorax (though these can become less obvious in old individuals of other species), and the legs are only black on the inside (so look mainly yellow unless viewed from the front).
The lack of any black extending down the sides of the frons, and the abscence of distinctive black markings on the abdomen helps to rule out darter species other than Common.
Thanks Roy. I had trouble getting close to this chap as I only had my little Sony pocket camera with me (max. 4x zoom). It kept buzzing off!
Your ID hints are really helpful.
Lat/Lng: 42.5515, 2.8865
Disused gravel pit