You have been offered a speed awareness course as you were on the threshold. If you were above it, you would be unlikely to receive the offer, and would have to take the points.
The threshold for this varies a little across various forces. For some, 10%+2, others can use 10%+3. As the ACPO guidelines are just that, guidelines, there's very little you could do to avoid course or points. Rushing a pregnant wife/partner to hospital is not considered mitigating circumstances these days, as an ambulance should have been called.
Do the course, go with an open mind, and be surprised at the cross section of the population you'll see there. The courses aren't designed to be confrontational, and I'd be very surprised if you didn't take something useful away.