Your default payment method on Amazon needs to be a Visa credit card.
It is - See the email C&P abov which they sent, specifically asking me to change my default card
That account is the only card details they've ever had on the account.
it's only if the visa credit card is your primary payment method.
It is, as I specified in my post "
Although I use Visa (Barclay Visa Credit card)" and also hence me copying the email they sent yesterday, which is the first I'd seen.
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I asked if anyone knew when they got theirs please, so I could double check through my folders/spam folder. Being in hospital for best part of a month and having rec'd in excess of 1k mail during that period, it may help me narrow it down.
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ETA - Here you go, screen cap from my wallet where it quite clearly shows default Visa Credit card.
I've done a search on my mail and not found anything.