Why don't you take five minutes to type your post code into the TV Licensing web site? You won't hear a peep from them for three years. Sounds perfectly reasonable to me, unless you enjoy being offended by their letters.
Agreed. I didn't have a tv in the UK for years and I registered as such. I never had a single letter or knock on my door. I wasn't avoiding the license, I really did not have a TV. It worked.