Withdrawing USD in the UK, from the Revolut $ balance

Hi,
I was wondering if anyone has had any experience with using an ATM in the UK to withdrawer . There are bank ATMs (like Raphaels) that allow you to take out USD, but I was wondering if I'd be charged twice? Eg would it be a conversion to £, and then a conversion to

Bit of an odd query but would be interested to see if anyone had any experience with this

thanks

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