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The large skipper is more moth like in appearance than the small copper and when basking sits with its fore wings at an angle to the hind wings, unlike the small copper which holds them all in the same plane. You probably already know it but there's an excellent site with pictures of both species: http://www.ukbutterflies.co.uk/index.php.
The scientific name used to be O. faunus but following a ruling by the International Commission on Zoological Nomenclature in 2000, the name has been changed to O. sylvanus.
Thanks for your help and additional information David. I'll certainly have a look at the butterfly site.
Moving from one flower to another.keeps wings folded. Sensitive to movement!
Lat/Lng: 52.079564, 0.996709
OS grid ref: TM054465