Here's my problem..... this is taken from looking at the front of the quilt (the triangle of paper is just so you can see properly, black binding on black fabric is hard to photograph.)
I fold the binding down on the 45 and sew straight across the 1/4inch seam.
But when I fold the binding over to the back, it's very bulky and the join is raised and very visible. I've just seen a close up in another thread of a quilt and I can't even see where the binding is joined at all. :-(