Picked up a Pace box from Tesco today for £194. Made them open the box to ensure it was a Pace, and even then they said I could take it back for a refund if the actual unit inside the box wasn't a Pace for whatever reason. I thought it was a good deal, given I know I've got a Pace, and have a full 12 month guarantee unlike most of the boxes on Ebay and don't have to wait 3 months for a fitting. So Tesco is another option if you want to guarantee yourself a Pace.
On the box itself there is a sticker saying "to the enigineer: it is imperative to carry out a software update before call back", I assume this is a forced download, will this be via the hidden menu or is it a hold the buttons down while powering on job? If so could someone remind me how to do this? I take it you do this, then you ring up sky and get them to change your subscription to HD? (already have sky+)