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Black antennae tips are the characteristic usually used and seem to show on this example.
At the BENHS exhibition last year there was an example exhibited of a Small Skipper with black antennae tips so perhaps even this character is not absolutely reliable.
Thanks David. How can someone definitely tell the difference?
Looking at the genitalia is regarded as giving a definitive ID.
Lat/Lng: 51.40257, -0.18504
OS grid ref: TQ263686