Not this old chestnut again! Have a proper search here on The AnswerBank and also see my accurate answer on the Digitalspy forums (with useful links to true and accurate information from the DVLA website, rather than guesswork);
It not only stalled at the "perhaps it would be a good idea?" stage - it never got any further and never will.! For some reason it has become the most prevalent urban myth among 16-17 year olds!
BTW, I had a quick search (2 mins) here on The AnswerBank and found this question asked (in various forms) at least 11 times since Sept 2005 and then I got bored. I guess it has been asked many, many more times than that.!!!