OK, I researched this so you don't have to!
From Quora:
"An Amazon gift card is only valid for the Amazon store that it is assigned to. So a gift card for Amazon.co.uk for example, will not work with Amazon.com"
From Amazon.co.uk
Quote:
2. Limitations
Gift Cards, including any unused Gift Card balances, expire ten years from the date of issuance. Gift Cards may not be redeemed for the purchase of products at www.amazon.at, www.amazon.com.br, www.amazon.ca, www.amazon.cn, www.amazon.com, www.amazon.de, www.amazon.es, www.amazon.fr, www.amazon.in, www.amazon.it, www.amazon.co.jp, www.amazon.com.mx, or any other website owned and operated by us, our affiliates, or any other person or entity, except as indicated by these terms and conditions. Gift Cards cannot be used to purchase other gift cards, or as payment for a Prime membership fee. Gift Cards cannot be reloaded, resold, transferred for value or redeemed for cash. Unused Gift Card balances in an Amazon.co.uk account may not be transferred to another Amazon.co.uk account.
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Very weasel language. There is NO warning anywhere that gift cards / vouchers are not transferable between market places. An experiment that's wasted £1, sort of,
EXCEPT that when registering the Kindle, entering the Gift Card code allows completion of registration without entering payment card (Credit or Debit card)!