@F4
I know someone who took the Theory Test and scored 100%; lost 10 points only on the Hazard Perception Test; and passed the full license driving test first time with only one minor fault; and they were 68 at the time, so age is no excuse. They had driven in the UK for a number of years also.
The DVD Becca highlighted on Amazon is the best (full version with Theory and Hazard Perception). I believe I saw one recently at Waterstones if you don't want to wait on Amazon delivery.
The Hazard Perception is interactive. The youngsters have the advantage over us old farts here since they're used to reacting to what they see on screen with a mouse click (Think first person shooters like Call of Duty). Whatever device you use to practice on, it must be interactive. And, do practice.
Take lessons. Six hours should be a good start. Try to take them in 2 hour sessions and be sure it's only you in the car, and not joint lessons with other students. It's a common statement here, but it's true: you are not learning how to drive, you already know how to do that. You are learning how to pass the UK driving test. It can be frustrating, and you'll be paranoid about looking in your mirrors and around you for months to come, but if you have a good instructor, it's worth it. Think of it as a refresher course.
And the most important point: each test is not a do or die situation. If you screw it up, you take it again, and again if need be. The poor young kids in this country set GCSE's, A Levels, etc., and those are do or die. They only get one chance and their future life can depend on it. That always puts the driving test into perspective.
And last: it's so easy to type all this BS when you already have a license! We tend to forget the sleepless nights we spent the week before we took the test!