I guess I have one account but still have to log in to each country’s site and true, prime works separately for each country. malheuresement…
There are all sorts of advantages and disadvantages to doing this different ways. And it can differ across the website(s) and app(s).
Be aware that Amazon will not show you all products across sites. It selects according to your shipping address, which it may have defaulted on a completely different country site, to the last ship address you used, on another different country site. And Amazon has other things it uses to restrict which products you will see when you search. Price for the same item at the same time varies wildly between countries, for example.
I have just done a few buys in the past week or so and tested all this out.
Best is to get some of the product-numbers (usually beginning with B often followed by zero) off the products you’re interested in and use one of the various tools available, to do one search only that automatically searches and finds availability and price across countries in one go. The same product can actually come as different product numbers too, sometimes. So also search in the tool using common Amazon word titles that came up in the first search - then see some of them that come up have different product numbers you can also then search on. Hours of rabbit-hole fun can be had 
Keep product numbers you like because most of the time this will make Amazon show the product you want and not only the products Amazon in a particular country only wants to show you.
Buying from the US now has same % customs and duty charges as buying from the UK. So if you’re having it sent, for many items (eg outdoor kit even by European makes, and IT kit) it’s cheaper overall to order from .com (USA) now than from .co.uk as shipping charges can be very reasonable from US and base price of items considerably lower. Though recently the fall in £ value against $ may have scuppered how well that wss working. If you want something English not findable in US, try .ie (Ireland), as .ie is EU so no duty/customs.
I started off with same address on each of a few Amazon country sites. Initially they were each kept separate but then without asking Amazon amalgamated them which was very annoying. Ebay did the same.
However a little contemplation of what’s good and bad about this is worthwhile. There are various solutions, and some advantages sometimes in some ways, to some options…ahem.
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Prime is local to each country. The offering, and price, can differ greatly for Prime by country.
If you use same email address across most country sites it will recognise you as the same customer, eg all your addresses anywhere will be available on your record to select to use on whichever country site.
Seen a big difference in daily cost, before changing lots of days high €3-4, none that high since. First PIC, early in the month, before I swapped and the 2nd after.
Hmmm…to see that we need to see the kWh graph, not the € one.
Have you changed your behaviour or does this reflect the lower cost of using Tempo?
The lower cost. We had moved to the base rate a year ago, which we worked out didn’t change our bill so decided not worth having HP/HC for no saving. Obviously now on Tempo so we have gone back to having the water heater on a HC fuse thingy and also set off the dryer / washer / dishwasher at night where we can. As white and blue cheaper anyway I’m not anal about those though, will clearly be on a red day though! I’ll change it to the kW graph and take another PIC for you.
And sorry realised what you are saying, I said consumption but meant cost. We won’t have changed our consumption at all!!!
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I’ve edited my erroneous post 
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OK, yes the authentication database is the same across all Amazon sites, but after that they are separate - my amazon.fr login only shows me purchase history from France for instance.
However the fact that if I try to watch Prime video content it seems to insist I can only use one of my UK or French subscriptions at any time - I’ve paid twice, why shouldn’t I be able to watch something available via my French Prime subscription while my family watch something available via my UK Prime subscription back at home, should I happen to be in France without them?
Try logging in via vpn for the country you want to watch. Aggravating but works.
I’m just about to start my Tempo contract tomorrow and was looking to see if I could already see what class of day it was going to be on the EDF app, but couldn’t see anything. Is that because I’m not officially yet on the Tempo contract? Or am I searching in the wrong place? Any pointers much appreciated 
When you are on the app you will get a daily email / text saying what tomorrow will be, usually around 11am. Today is rouge. Tomorrow white. (Never rouge at the w/end)
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White day tomorrow. I use this site, EDFs own site doesn’t update until 6pm where this one does 11am updates:
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Tory, don’t you get an email / text at 11am? I do.
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See I’m an anti app’er so don’t use that. I get a text and an email at 11am for next day red. Not bothered between the other colours as they are cheaper than what we’ve been on. We are making an effort to put machines on overnight. Today will be so cheap, we are heading towards 24 hours without electricity now, handy on a red day 
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Cross post! Yep sure do!
Of course - you are right - not for white or blue. I’m not aware I have an app? But they have my email and mobile and so send to those. For some reason I get the messages twice. 
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Will you truly have a day without using leccy… or just without appliances ??
or are you talking about being temporarily cut-off?
I was fighting with candles last night.. due to unforeseen circumstances…