Doh!
Back to the drawing board...
For those with time on your hands, it's the M&S long sleeved double breasted reefer coat at £49.99. Only comes in pale grey, and is a wool mix.
I tried it on and loved it. Don't need it. But think am going to get it (evil grin).
It has very impractical looking button-down pockets which are in fact ordinary comfy pockets in disguise! Genius!
Basically, I love it.