I attached and programmed the machine and started. It was a little difficult to get the teeth of the zip into the groove correctly but easy once you know how, the machine walks slowly opening the zip teeth stitching close. The end result is a perfectly invisible zip in the seam.
Next time I will take the time to tack the zipper tape exactly where I want it as it had a tendency to move inwards. I am now looking forward to a dress project with an invisible zip - I can't believe I said that!!
The final result...
The cushions were wonderfully received by the children and will make the library corner a popular space. And I am happy as I used up some stash helping in the sewing room tidy up.