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.
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.