I like this "payment protection" argument. Is it still valid end of September when one paid mid of June? 
It is valid for many years under Section 75 of the Consumer Credit Act 1974, which simply states: "Pay for something costing between £100 and £30,000 on a credit card and the card issuer's equally liable if something goes wrong."
This only applies to the UK.
Which is why I state check with your card issuer.
For sure American Express has significant consumer protection in and outside the UK, it's why merchants by and large hater their fees, they are on average a percent or two higher than Visa or MasterCard, but thy don't f**k their customers around as much.
Germany from what someone said around the time of preorders has a bum deal in comparison to the UK, but again check as I don't know other countries or other banking institutions level of cover.
I'd imagine Amex everywhere is the best though in general...