So you have to make a SORN declaration if you don't have a TV now, instead of quietly getting on with your life? 
Yeah I know!

What the hell's going on, they're not even a regulatory body or government agency or anything like that, just a private firm tasked by the BBC to get the TV
tax licence fee.
I've had trouble with them before. I sent them a recorded delivery letter telling them it appears I am more familiar with the Communications Act 2003, and that I will remove any licencing 'officer' (that's an overused word now), from my property if they knock again.
One of my dads old tenants was an old man with learning difficulties, no family, lived in a bedsit, simple life. He was hounded by them, my dad tried to tell them, and they said that they would stop sending letters for 6 months - bloody stupid. The guy didn't have a tv, just a radio. Because he wasn't the sharpest tool in the box he even pulled the tv cable out the wall thinking that would stop the harassment - it didn't.
At the height of the this problem he was found in the river.
Of course it can't be proven that he killed himself because of this, but I know what I think.