As far as I know Banded Demoiselles do not occur on Gower. This one, photographed on 12th August 2012 in the Clyne Valley, may represent the nearest location to the AONB. Beautiful Demoiselles are also know in the Clyne Valley and at a few location inside the AONB. It would be nice to plot their local distribution!
Derek, distribution maps below showing records held on MapMate database for Glamorgan (vc41) [BS]