In reply to supersteve:
Ignore it. If you're lucky you'll get one each month building up to a frenzy of threats before it resets back to this original one.
Obvs if your company needs a license you should get one but if it doesn't you are under no obligation to reply to this guff.
If the TV people turn up they only have power to inspect your equipment if you have equipment (this power is on the books so that they can check you aren't watching colour TV on a B+W license and is essentially obsolete). No equipment, no right to inspect.
While this is out-of-date wrt to the modern world they don't have a right to inspect anything just because you have a computer or internet so just politely ask them to leave and don't give them any details including your name or anything else and don't answer any questions. They know the score they will politely leave when asked with no bother.