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I think you are right Chris.I have now looked more carefully at the differences between the two on the www.butterfliesoffrance.com website and Small Heath seems always to have a rather "furry" underside to the wing when compared to M. jurtina.
I guess this may be diagnostic...? It is certainly easier to determine which is which!
Lat/Lng: 42.546820474167, 2.8725814819167