Is this plumage within the variation of a first winter Great Grey Shrike (Lanius excubitor excubitor) or is it an intergrade of some kind? Could it just be a moult retarded excubitor?
Great Grey Shrike in Denmark
On Tarsiger there are photos of two possible sibiricus candidates seen in Finland with the first bird here, here, here and the other bird here and here. Few comments on the Finnish birds are here.
Photos of another possible sibiricus candidate seen in Sweden are here. Just to add some other characters please have a look at this homeyeri left next to an excubitor which was also seen in Sweden.