Notifying them works for some but for others it does nothing at all.
In fact, I know people who have notified them only to have Capita agents banging on their doors demanding to be let in so that they can prove they don't need a licence. The problem is, if they see that you have the iPlayer APP on your TV or something they might well try to use it as evidence you're dodging the licence fee even if you don't use the thing. Capita are not a trustworthy organisation, I flat out refuse to deal with them.
The best thing to do is to just ignore them and bin the letters, if anyone knocks at your door and you know it's a TVL enforcer don't even answer.