Had a delivery problem and asked them (Amazon) if they had a policy on inconvenience. They are not capable of answering other than by long formulaic irrelevant emails which obfuscate and deflect responsibility away from them. It is between buyer and seller apparently, nothing to do with them; no policy, no opinion. You wait in; it doesn't arrive; hard cheese.
So here is the advice: check prices etc. on Amazon by all means and then go direct to the sellers website, (if necessary negotiate the same price) i.e. buy direct from the seller but probably only if it is over a hundred quid and you are using a credit card which will cover any meltdown.
Amazon just gets in the way by trumpeting about its marvellous but nonexistent dispute resolution scheme and then removing email addresses from correspondence (and not forwarding tracking numbers apparently, so the seller said); weird!
My order got cancelled - refund seems to be OK, I guess they have had plenty of practice. All mildly unpleasant and a complete waste of time. I'll avoid them in the future; I seem to get on better with eBay.