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My guess would be the European Warer Vole, they make burrows similar to these, especially by streams and lakes so if you're near a body of water it's a good shot. Their burrows are generally over 7cm so for you to say 10 is good. Without visually sighting the animal we'll never be sure but from the descriptions provided it's a good shot.
I'll provide you with resources in the comment below, once I retrieve them.
I believe this qualifies for the rare color morph mission, http://www.projectnoah.org/missions/7970... and would be glad if you added it, if not already in it! I found this link for you regarding red foxes and their morphs,http://livingwithfoxes.weebly.com/colour-morphs.html.