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Could it be Chalkhill Blue?
Yes, I think it may have been. From memory I saw chalkhill and adonis blues, but when I returned home, I found that I only had pictures of the underside. So I think you are correct, and this is a chalkhill. I will have a look at the field guide and make a correction.
I too think this looks like a Chalkhill Blue
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
Lat/Lng: 50.9723, -1.9493
OS grid ref: SU036192