What is the maximum amount you can withdraw from an ATM in the USA? I have a UK credit and debit card and can use either to withdraw cash. I know I will be charged a fee so I want to withdraw as much cash as I can to limit the fee.
Limits are set both by your bank, which imposes per-day and per-withdrawal limits, and by the machine, which imposes a per-withdrawal limit but will allow you to make as many individual withdrawals -- for an additional fee of course -- as you like.
Many independently owned ATMs have $200 limits, which is ridiculous if you ask me, but the limit on most bank-owned ATMs varies from $300 to $800.
You're generally limited by your bank's or credit card issuer's limitation on the daily withdrawal of cash from the ATM.
Depending on the type of account you have and the amount of money you have in it that amount may vary. I've known some people who have had business accounts that allowed them to withdraw $1500 daily, and I've seen them getting that much out too. So you should check with the credit card issuer how much you will be allowed to get rather than checking how much an ATM will let you have.
In addition you should check how the fees you pay will get calculated because I've also known some that are calculated as an amount per $100 withdrawn and so on but you don't pay any fees to the ATM holder (PNC Bank for example).
You need to ask your bank; they are the ones that have the final say - and they may also be able to tell you which ATMs to use.
As there is very little in difference between GBP and USD - your only challenge will be to find an ATM that isn't restricted by the ATM operator on foreign cards.
If you were traveling to a country where the exchange rate is considerably different, then you would be limited by the maximum allowed by the ATMs (as the majority of ATMs will only dispense the local currency) - which would be different than what your bank allows on the card.
Keep in mind that carrying cash is not as much of an issue as it used to be; card acceptance is almost universal in the US.