I went on a one-day Camping & Caravan Club Course last September. I live near Manchester and I attended the day course at Lancaster although there is (or was) a nearer venue at the Velodrome in Manchester.
I didn't own a van at the time (I have just bought my first van this week!)but I thought preparation was going to be useful & indeed it was. I put my training into effect on arrival at home last Friday with my new caravan, though I must admit I was very rusty. I guess there is no substitute for actual practical experience but nevertheless it was a very useful exercise.