After much searching by myself & you Grandad I gave in & via PM via FB I wrote to the Richard III Society yesterday 19/2/15.
My answer back from them was:
From Richard III Society 19/2/15
We have referred this to our greatest experts and, sadly, cannot find a record of such a commission. Could this have been a novel, perhaps?
I have backchecked, and I'm afraid there is no contemporary evidence for such a window. Could it be that you have read this in a novel?
As I said at the beginning I couldn't remember the title & author of the book I read


