Scandinavian Chaffinches?

I've not done a huge amount of garden ringing recently but one thing that has struck me is how large some of the Chaffinches are I've been catching. This 1st winter male was almost Greenfinch size with a wing of 92 mm and a weight of 27.6 g. In fact when I entered the ringing data  I got an error message up saying this was above the heaviest weight normally expected for this species. it also appears to have a deeper and chunkier bill.

So where are these large birds from? Probably winter visitors from Scandinavia along with the large Blackbirds I've also been seeing.