Bill, if you already have Sky+ you don't need to buy anything. Just cancel your existing subscription and keep the card inside the box, it will become a FreeSat card when your subscription expires. Saves you £220.
You will still have the FreeSat channels.
If it's because you want to upgrade to HD and keep the ability to record programmes then go for something like this:
http://www.richersou...-foxsat-hdr-box