What is this bird

I live on the south coast of England and am a keen birdwatcher.  However in my garden over the last few days I have seen a group of birds I cannot identify.

 

They are in a group of about 7 and are the size of a thrush/blackbird.  They are grey/brown with a white chest, with red on the upper chest .  I have no idea what they are and any books I have cannot identify them.  Would anyone else have seen them or know what they are.

Thank you