Why not get the license when you buy the TV? Here in the U.S. you can't buy a car unless you have the proper license and registration. Then renewal would be done through the mail or you would have to give proof that the TV was sold, stolen or thrown out.

You Brits seem to enjoy taxing things. Take another suggestion from us "Yanks" and start dumping your TV's into the Thames.   It worked for us with tea!