I never understood all this TV license issue. Every time they've knocked on my door I've told them i don't accept door to door salesmen and tell them good day. That's all they're doing, they have no legal rights to demand entry or information of you.
And I refuse to pay such a silly license. If they want to fill my house with their airwaves without my consent then I'll use it without their consent
And as snaps said, why not just create a system that makes people pay, like nearly every other service out there. I can't just plug a phone into the wall, or a virgin media box, or a wireless router, and just expect the services, and it is then up to me to go and pay. If you don't pay in the first place, you don't get the service. Not my fault their system is so shit.