You can apply for exemption [0] - needs to be reconfirmed every 2 years and sometimes more often if TVL/Capita thinks there 'might' have been changes you did not report (e.g. you subscribed to a service that participates in their reporting scheme - NowTV is one of the providers that reports their customers). You pay nothing if you qualify for one of the four exemption bases.
Note: if the exemption lapses without a new one in place (or a license purchase), they will actually send goons to 'investigate' after a short period.
The official word from TV Licensing is quite misleading (which admittedly is in their interest). You do not require any exemption nor to correspond with them at all.
Their "officers" are private individuals employed by a private company who have no special rights to enter your property. Absent a search warrant, it is almost certainly a mistake to allow them to enter your property.
Note that it's not a _legal_ exemption -- there's no requirement in law to register that you _don't_ have a TV, but they'd prefer you did so they can target their harassment more effectively.
I've given up telling them -- it's less effort to drop their letters in the bin, and appears no less effective at stopping new ones arriving. That was after being "visited" a few years back and the goon trying the classic "if you've nothing to hide".
