I pieced the strips together staggering them each by 2" to minimise wastage when they are cut at 45 degrees. The seams were pressed open to make less bulk when sewn to the quilt sandwich.
I used the 45 degree line on my ruler to trim off the staggered ends and then measured the width I wanted my binding. I use a 2 1/4" doubled binding so I cut as many 2 1/4" strips as I could. You should get 13 out of a width of fabric.
The short strips were sewn end to end and the seams pressed open. The binding was then pressed in half and voila! A gorgeous pile of pieced double binding ready to be sewn to my quilt tomorrow.
Be careful when you're pressing the binding in half because it is now cut on the bias so it's quite easy to distort the strips. Make sure to press straight down rather than pushing the fabric along the ironing board.