Hi I'm looking to buy my mum and dad a freeview digibox for xmas. Thing is I don't know much about how freeview works etc. Out-of-the-box, do systems differ (i.e. will one box offer more 'free' channels (i.e. no monthly charge), or is there a standard 20 or so channels that are supplied with every digibox and you can't get any others unless you subscribe to individual channels? Cheers PS: Which box would you recommend?