finally I got the pictures of monday's presumed Grey-backed Thrush - I think the pictures will prove this assumption.
Note the finer spotting (orange and not dark or even black on the flanks), the well-demarcated streaky rather than spotted breast and the larger extend of orange on the flanks (not clearly visible on these pics, though) as well as the more grey overall impression.
First winter female Grey-backed Thrush seems like a reasonable ID to me.
Oh and, don't get confused with the other thrush...
Falk (all images - Roland Männel)