Ah right, another scam, in this case by government/DVLA, to grab money and make the lives of the decent citizen as unbearable as possible then ? So what's news ? Today's world is like that, a species gets the society the worst of them create.
here is what the article says: "While most motorists know that tax discs are no longer required, what is catching out many is that vehicle excise duty is automatically cancelled if a car changes ownership – even if there is a valid disc in the window. - No sympathy the rules are very clear and simple, new keeper can use the V5C/2 to tax it, old keeper will get a refund when they send off he V5 very simple, vast improvement on the old system.