No, I didn't have to pay more. I paid the same price which I had ordered it at.
But QVC were obviously happy to sell the stock they had just received to fulfil new orders (at the higher price) before allocating any to customers who had already placed their orders 6 weeks earlier.
I assumed that a large organisation like QVC would have an automated system which would flag up that new stock has arrived and allocate this to waiting orders, before changing the status online. Maybe it still needs manual intervention or someone forgot to set the relevant alert.
So, I am not sure whether I would have got my order or not.