Speed Awareness Course is very nice. I am ashamed to admit I have been on two in the last few years
Exactly the same case caught me with 54 in a 40 on my local road on a place with mobile speed camera which usually sits there Sunday which I know perfectly well. I have to say I do NOT ride like lunatic. This day the sun was shining and I was just admiring the skyline
The second time the guy who led the course was a advanced police biker.
Actually the thing is not a course at all. It is more like presentation with Q&A and a breaks for tea and nice biscuits. Because you pay £95 usually the venue is nice and the tea with the biscuits are free.
You listen most of the time. Its fine to have few jokes around. If successful everybody are laughing. Sometimes there is a silence. You know the joke was bad or inappropriate or both
All in all the best expereince you may have related to speeding
Just go there and make sure you are not late, its fine.