To the OP, It depends where you’re doing it, lancs do 2 hrs in the classroom and 2 hrs in a car with an instructor. Cumbria, for example, do 4 hours in the classroom. It’s all pretty straightforward stuff, no telling off, no preaching as such. Stopping distances in different road conditions, how to spot the speed limit quickly, on the road you’re on, type stuff.
The worst part is that there will probably be a bloke there who’s a complete cynical know-it-all and another bloke who complains and whines endlessly throughout the whole day about the injustice of his specific indiscretion.
Cougar, not all areas offer the option, altho I seem to recall the lady running my course said it was going to be offered nationwide. Also, depends on the circumstances of your case, mine was in Lancs (who do offer it), I was caught doing 36 in a 30 zone. It’s been said that it also depends on your age, certainly there were no youngsters on my course, not sure if that’s hearsay tho.