Thanks Jeanette, Beren, Michael, Paul, Doug, Kev and Jase...
Have reprocessed the image and have brought out the fainter arc better and a little more detail in the neb itself but just a tad noisier.
Doug... Just a very small amount of noise reduction done on this, it was a real cold night with plenty of frost! and this 20D has low noise compared to my old 300D
Thanks for looking!