Blue Butterfly

With it being such a beautiful day I combined a walk on to the post box with a wander in the fields around the village. There were plenty of butterflies but they were all very active. I saw a small bright blue one of a type I have not seen before. It would only stay stationary for a few seconds and as I only had a Fuji "bridge" camera with me (it is always a mistake to go on a walk without one of my Nikons!),  getting a photo was difficult but I managed the ones below.

Looking through my copy of "The Butterflies of Yorkshire" ( available from The Yorkshire Branch of Butterfly Conservation ) I think it is a Holly Blue. I would be very interested to have my identification confirmed (or corrected).

Update, I have been informed that it is a Holly Blue and that they are slowly moving North. Since my first sighting I have seen others every year since.