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You have 2 different species here.
Edit - One image removed.
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Yes you are right I was uploading photo's from the weekend and mixed them up. I was also using the "big butterfly count ID chart". Their ID chart shows two spots on the large white and only one spot on the small white so I must have got confused. Thanks for advising me as it is extremely important to get it right. I am still uncertain which this one is.
Both can have 2 spots! I find they can be tricky to tell apart but the black mark on the wingtip stretches more than halfway down the wing in the Large White.
Lat/Lng: 52.6, -1.2
OS grid ref: SK5604