You can have a house full of TV's and recording equipment - if you don't use them you don't need a licence.
Huderon is absolutely correct (as is the Authority website).
You don't need a TV licence if:
"You don't use your television set or other device to watch or record broadcast programmes
If you do not use your television set, video recorder or DVD player to watch or record authorised broadcast programmes (that is, BBC, ITV, Channel 4, Channel 5, cable television or satellite television) you will not need a licence. This means that you would not need a licence if, for example, you only:
use the television set as a computer monitor
use the television set to play electronic games
watch pre-recorded videos or DVDs, whether or not these have been bought or recorded by someone else.
However, the television set and must be incapable of receiving all authorised broadcast programmes. This could be done, for example, by making sure that neither the television set nor the DVD or video recorder are tuned into any channels and ensuring that they are not connected to an aerial."