NatWest have very high charges when it comes to currency exchange, although I haven’t tested this with Amazon the alternative is to get pre-pay $ card from likes of FairFx (as they charge no commission). You top up as much as you like in pounds from your UK account this money is then converted to dollars and loaded onto your pre-pay card, the card as far as the retailer is concerned is a normal US dollar Mastercard credit card and there are no extra hidden charges.
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