Spitfire identification needed, please

I found this picture of a Danish Spitfire, but I can’t seem to make heads or tails of it. It must just have arrived from England, as the Danish Air Force used different registration numbers/markings. Also I’m unable to find any Spitfire with connection to the FM registration anywhere in the lists of Danish Spitfires.

Dear Forumites, please give me any information you can muster about this bird, even if it’s trivial.