Does the computer have wifi installed? If you go to the Apple Menu>About this Mac does it show any info regarding WiFi or Airport? Or, have a look in System Preferences>Network - if wifi or Airport is listed, turn it on and see if it finds the Sky network.
Also in About this Mac it'll say which version of OS you have installed. Please post that information. Scratch that, I see you posted in the Lion (10.7) forums