Thanks. I did have an adaptor made up to connect the scope to the flattner. Its only 8mm but it is still metal (silver) coloured.
Could that cause reflections?
You have a shiny silver adapter in your image train? If it is silver on the inside that could very likely be your problem. If your flattener was not spaced correctly you'd notice it on the edges and corner of the frame as misshapen stars. Get some flat cammo spray paint from your favorite big box store, or a tube of chalkboard paint from your favorite hobby store and flock the inside of that adapter. You don't want anything shiny at all in your image train. Not even shiny black anodized stuff.
Post up a full res image unedited and we should be able to tell if your flattener is working. But as mentioned by WebFoot, this looks like a reflection problem, not a spacing problem.