Natwest at a glance
According to the https://www.natwestinternational.com/ website there is no charge to convert money between currencies.
They then go onto say that “Any costs are built into the agreed rate applied to the Foreign Exchange transfer, which includes our margin. The margin applied varies depending upon how much you want to trade.”
That type of hidden cost of Foreign Exchange is what BER makes easier to calculate here.
You Can Save Money when you Compare Natwest Bank Exchange Rate Margins & Fees
The below comparison table makes it easy to calculate the Total Cost you are being charged on your currency transaction by 
Natwest Bank versus the market mid-rate. It is easy to calculate any savings available from popular market-leading FX providers.
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