Unknown Andrena species.
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That would be my guess based on "Bees of Surrey" but its so difficult from photographs isn't it - thanks so much for giving it a go!
Hi David, It seems a good match but as you say it is so very difficult as there are so many species. You have taken a very comprehensive set of images and the white hairs underneath rule out a confusion species A.thoracica, I think !!!!!!!!!!
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Thanks again for your help Chris - the habitat might also tend to argue against thoracica, as the Tudeley woods car park is on high woodland on clay - and the heathland is on the other side of the road, which I think thoracica might like.
I'll eventually have to start catching a few of these I think, but at the moment I'm learning such a lot from trying a few photos,
Lat/Lng: 51.1659, 0.3105
OS grid ref: TQ616432
In fringe of trees on edge of car park