Do not buy! I got the skills test DVD for Christmas last year and I thought it would be really good as it was described as taking you through each maneuver and explaining what the examiner wants to see.
Well it lasts for 27 minutes (or something like that if I remember correctly) and lacks so much detail. I got to the end and thought there must be more to the DVD than what I had seen but there wasn't. I wrote to John to say how disappointed I was and after many emails I finally got a refund.
Kind school DVDs are much better! :-)