One of my cars was MOT'd just after the tax expired and failed on emissions. A sensor was ordered and fitted and the car passed on the partial retest. The car is insured and I have just paid for the VED which states that it runs from the 1st April 2014. However, we are now more than 14 days into April and I don't think this grace period for not displaying a tax disc applies because I would have had to apply for the tax disc before the old one expired to take advantage of this. Clearly, I have a taxed and insured vehicle but am I right in thinking that I could still theoretically be done by plod for not having a valid tax disc displayed even though my tax is paid and the disc is no doubt in the post? Come 1st October? I think this all becomes academic as the tax disc will be no longer. The safest thing is not to drive the car, but it seems unfair that I can't drive it when I've paid everything. Am I being too cautious?