You won't get points for no tax, you may get away with it as you just bought the car and had applied for it. I've done it in the past before we had this big brother state and its no big deal compared to what some people do. There are people in London with no anything, not even a license and they couldn't give a $% about it. On some of the big routes here, the Police will have a car transporter lorry with them, set up a road block and when the trailer is full they drive it off and they all get impounded. They have a van about a 1/4 of a mile up the road scanning the number plates. The info response on a scanned number plate is now 8 seconds, by which time the scanned car is approaching around 10 traffic cops with BMWs and motorbikes in case a bit of hot pursuit is required! There are mobile camera vans on the prowl all the time now.