Beware inaccurate advice:
Julie Robertson, the head of the driving offences team at law firm Simpson Millar, says: “There is no question that having taken part in a speeding course can, and often will, inflate a person’s insurance premium - sometimes quite substantially.
“Several of my clients have reported significant rises in their insurance premiums after they attended a speeding course, and subsequently informed their insurer. Clearly, it is interpreted as an element of enhanced risk despite the fact that it might actually be the opposite.”
Experts say that premiums can rise by between 10% and 30%, but it depends on your insurer because not all ask drivers to declare a course.
https://www.theguardian.com/money/2016/jan/27/why-speed-awareness-course-could-hike-up-insurance-premiums