I've bought a policy, but I'm not able to tax my car online. It is saying that my car is not insured, why is this?

It can take up to 7 days for the Motor Insurance Database (MID) to update and recognise that you have insured your vehicle. During this time you may wish to carry a copy of your Certificate in your vehicle as proof of your insurance. If you need to tax your car within these 7 days you can take your Certificate of Motor Insurance into the Post Office. If you want to check your vehicle is insured go to http://www.askmid.com/.