Hmmm, not a Redwing, but I'm convinced it's a thrush species which leaves us with rarities from eastern Europe, outside of my experience, but a 1st winter Black-throated Thrush would be the nearest. Described in the guide I'm looking at (not Collins, can't find it) as being neutral grey above with paler grey fringes to the wings, and dirty white almost unspotted belly. An interesting bird that would get the pulse racing I think.
I better camp out all night then and try to see it at the "crack of dawn"
I nip out and have a look as my wife has just popped off to the supermarket and she will be "forever" (as usual) - - it's only in the front "garden" -