Here's a possible solution
I saw this at the end of an article written by Richard Aucock for Motoring Research. Seems like a good plan to me.
The treasury will be keen to solve this dilemma, particularly as the amount lost due to licence evasion has gone up so dramatically. The answer, it seems, is simply a better reminder system.
Motoring Research has one idea that might work: a brightly-coloured piece of paper on the windscreen telling everyone who looked at it if the vehicle was licenced or not, instantly, at a glance.
Even if the car’s owner forgot, their partner, or kids, or neighbours might spot it. It would be very obvious indeed if you’d evaded road tax – and who wants the embarrassment of displaying to the world that they’re a tax-dodger?
We estimate it could only cost £10 million a year to enact, a mere fraction of the amounts being lost to road tax evasion. It’s such a strong idea, we’ll certainly be sending it on to the DfT. We’ll let you know how we get on.
Full article at