You have to have a veiwing card to make it work. The viewing card number is locked in specific to a box and has to be registered with Sky before it will work.
Also remember that SKY+ require two feeds so if you don't already have a suitable LNB on the dish you will need to aquire one or pay the installer extra to supply it and if you want a guarantee I would be surprised if you could get the job done for £30
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"The Nac Mac Feegle are, well, they’re like tiny little Scottish Smurfs who have seen Braveheart altogether too many times."