Bee - Andrena sp. possibly A.scotica ( carantonica ) (Andrena sp.)

Anyone with an interest in bees and has looked at Steven Falk's excellent photographic identification catalogues on Flickr will understand my reticence in putting forward a positive ID as it is an absolute minefield to a novice like myself.
I'm not even sure it is Andrena sp. but that's the most likely but if anyone out there recognises it please let me know.

All I know for sure is that it was laden with pollen and I liked the way it seemed to be peering over the top of the flower as if checking the coast was clear before taking off.

NB/ I think it may be Andrena scotica - Chocolate Mining Bee which was recently known as Andrena Carantonica but it is reverting back to its older name A.scotica.