Not in 4 days no, its true, but, the system is automated, I had an automated letter telling me to sorn it or face a fine after i swapped insurance recently, but left the tax on the vehicle.
Wrong. If the car isnt insured it must be SORNed, if its not you can be fined, unless you are being pedantic that it wont be the DVLA that issues the fine, but the government.