Large blue Butterfly

Observation - Large blue Butterfly . Description: Large blue butterfly or at least larger than normal . Had white along the border of its upper wings and speckles underneath . Never seen one before . I tried to take a photo but by the time I got my mobile out it was gone . Site was a old sports field w

Large blue butterfly or at least larger than normal . Had white along the border of its upper wings and speckles underneath . Never seen one before . I tried to take a photo but by the time I got my mobile out it was gone .
Site was a old sports field with mostly grass some heather and wild flowers between urban gardens and woodland behind the road of Marbles Way Tadworth Surrey .