There will never be a situation where QVC UK can offer the range and choice of QVC US, nor the financial offers (eg: combining easy pays and auto delivery).
The first comes down to the sheer size of the US market, and the second is down to completely different financial regulation.
I think that potentially the impact of other routes to market for products is not yet felt as acutely in the US either (ebay, amazon, infomercials, individual shop websites etc), and far more US customers live long distances away from towns where you can do a dreaded high street shopping trip (or even a mall, for that matter).
I do think that the presentation style is the area where QVC UK could strive to emulate the US more. Let's have less banshee shrieking. Let's have more professionalism (sell the products you're being paid to sell, not your book/b&b etc). Let's have the relevant information to aid a purchase decision (it's just downright lazy to keep saying "call Liverpool").
Honestly, I think it's actually time they sent some of the US presenters over here to teach the UK presenters a thing or two about how to sell without driving viewers to the mute or change channel button. Some of the Brits may think they are the bees-knees in the sales department, but employing your voice as a Timmy Mallett Wacaday weapon to berate and batter your customer into submission is not a good tactic for the longer-term health of your sales.