|>>|| No. 27513
>You are under no obligation to inform them that you don't need a license if your premises is currently unlicensed.
This. You can basically ignore them. They send cycles of scary letters, but after a while you'll get the pattern. They only bother doing house calls if they have enough of them in the area to justify it, and in any case you don't even have to answer the door.
Some people will tell you about various notices you can send them. Ignore this advice. TVL have some funky powers when it comes to search warrants, to the point where "obstructing a warrant" is a separate offence. They don't have much of a budget for actually doing this, so they use these sparingly, and sending them nastygrams is a really good way to get yourself on their radar.
In short: just ignore them.