Don't order with PC World. I pre ordered the i7 because of the £100 cashback. I cancelled the order last Saturday and reordered with Microsoft. It was a total farce with PC World. Despite their site twice saying they had stock, my order didn't ship. Twice I phoned them and they told me that they had the stock in the warehousr and dispatch would be that same day. But eventually they admitted to never having stock. They finally sent a ludicrous bulk email saying some waffle about "holding their hands up in error", and that they had no stock ETA and that they would automatically cancel the order unless I called them.
My surface arrived from MS within one business day, and the 10% cash back from quidco seems to be processing properly.
Me rep told me to look at my contents insurance as complete covers two accidents per term and it's not exactly cheap, he mentioned a exchange unit when the fault is yours is £350 bear in mind the policy price plus the excess it's near enough the same