It varies so much on whether they offer the course or not. But I wouldn't use lorry excuse, I was in court where a guy on a motorbike was caught speeding, by a policeman with the laser gun. The bloke was sticking to the limits but went 6mph to get round a lorry due to spray, photo showed it was wet road and raining, with the lorries spray. The magestrates wouldnt have any of it as he still broke the law even though he appealed against the decision. All in all it cost him many times more than it would of been to take the points and fine.
I'm shocked how I've still got a license tbh, I've had the local sergeant take my keys off me for my car on a speeding occasion. Yet I've still got a clean license.