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Having the luxury of access to the ICZN office and an interest in nomenclature, I checked this out. The valid species name of the Large Skipper is sylvanus, now generally considered to belong to the genus Ochlodes, hence Ochlodes sylvanus (Esper, 1777). This follows a ruling by the International Commission of Zoological Nomenclature in 2000 making the name sylvanus available.
Omitting a load of technical details - basically the ICZN resolved the confusion caused by the recent use of a variety of other names, some relating to eastern Palaearctic species which may or may not be related. Sylvanus was the name used for 150 years before the confusion started.
The name of the UK Large Skipper is likely to remain stable now because:
* the type specimen of O. sylvanus is from western Europe and is considered to be the same species as that in the UK
* the name sylvanus was published very early, 1777, and so has priority over all the names with which it might conceivable be synonymised.
Thanks to all the people who have already pointed out that O. sylvanus is correct! There are a number of web sources which have still to catch up.
Devyatkin 1997 Case 3046 Bull. Zool. Nomen. 54(4):231.
ICZN, 2000, Opinion 1944 Bull. Zool. Nomen. 57(1): 56.
Full text of these articles available at: http://www.biodiversitylibrary.org/