[chris9991]

From http://www.sky.com/shop/freesat/home/faq/

I already have Sky digital satellite equipment - what else do I need?
All you need to gain access to the free channels available on the digital satellite platform is a Freesat from Sky viewing card, which costs just £25. If you’d like to access the interactive services available, you’ll also need a working phone line. To purchase a viewing card please phone Sky on 08448 244 400.