Thank you for all your replies.
I have just ckd my last set of blood test results and my Serum Ferritin was 301 so not low. I take 2 tablets every day anyway as I suffer from lack of absorbtion of iron. This was tested many years ago as I was contstantly anaemic and so have remained on this ever since. As I understand it the iron level in the brain is/can be different to a normal ferritin reading but have no real knowledge of this.
I am also suffer from migraines, I wonder if there is a link? That would be an interesting study for someone to see what % of migraine sufferers also have RLS!
In the meantime I will just have to wait for my scan results to see if it shows anything.