You simply connect your IPTV-box to your broadband connection and can then watch UK TV channels directly on your TV without the need of using a computer. You do not need to watch TV on your computer, the computer does not even have to be switched on to see UK TV. If you have some technicall knowledge the setup is very simple, but those who deliver such solutions will of course assist with installation and setup if needed.
Most suppliers operate with one year subscription on UK TV in Spain.
NOTE: You can not use wireless internet via USB modem as these have limitations in the number of MB that can be downloaded per month. This limit will put an effective end to your UK TV channels within a few hours of use.