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Its a long time since I saw nasatum and I don't have the key to hand, but I thought it had a much narrower projection on the front of the head.
you could well be right, have added a second image not that it helps much. i id'd this back in 2004 and i can't remember if there were any other reasons for going for nasatum at the time.
I had a look at the key last night. I think it is just vulgare.
Lat/Lng: 51.7589, -0.724511
OS grid ref: SP881074