The grief bit is so that you can get someone to come round and see you and you can ask them if you dont believe me.
As for owning a tv that you don't use for watching live broadcasts no you dont need a license, that doesn't mean they believe you and would be for an inspector to decide, till then your fine, it's a flaw in the system as already pointed out. However if they came round and you had a peice of coax hanging out of the wall connected to an aerial then they would likely make you get a license.
There was a large number of people who called to state they didn't need a license that then after a visit actually got one.
