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This was from March about Brexit-related interchange rates on Visa https://news.sky.com/story/visa-to-hike-interchange-fees-for...

From the article:

"The move to increase interchange fees will bring it into line with MasterCard, its rival payments group, which announced a similar move in January"

So it seems that Visa rate trails the Mastercard one and they will be the same.

Note that this only applies to UK payments to EU companies. It would not apply to almost any Amazon purchases as they are usually from Amazon UK.