Just checked, it says on the front page that you can apply via that service if you have a current SORN certificate. You may have to ring them up if the site's refusing to play.
Why do you think they'd be able to find the records, it's not insured at the moment.The database they check is for cars that are insured, not cars that will be insured soon.
Thanks ChuckF. So if the car is uninsured then it will not be on the DVLA database for tax Ok. So I have to wait until 20th to tax it. My next question is can i drive the car with out a tax disk in the windscreen just from Folkestone to Birmingham?
I don't think the printing of anything really matters, as long as your car isn't seen in any car parks without a tax disc you should be ok driving for a couple of hours. If on the off chance you got pulled over and the police saw no tax disc it would take them a matter of seconds to run it through their system and find out the car was taxed.
Your problem is almost certainly caused by your insurance details not yet being in the DVLA database.
My wife's car tax ran from 1st April every year. The car was purchased around 20th March, which is when the insurance ran out/needed renewing. We could never tax the car online as the insurance details were never updated in time. One year we taxed the car for 6 months to move the date. End of problem.