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Its easy to tell Song Thrush from Mistle Thrush if you can see the marks on there breast as those on the Song Thrush are upward facing arrow heads while those of the Mistle Thrush are round spots, hope that helps
Thank you all for confirmation of the ID and thank you Ferret for the comment.
further to Ferrets comment - if you hear the Mistle Thrush (it's alarm call is very distinctive -like an old football rattle) and it is also very 'gray' in appearance. Nice photo
Feel free to look at my ongoing (hopefully improving) collection of pictures on Flickr:
Lat/Lng: 57.6, -3.7
OS grid ref: NJ0459