Can I rely on credit cards in London or should I get currency, and where?

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I will be in London for most of just a single day plus one evening & overnight stay, and plan to find some fun things to do as a tourist. I also plan to buy some souvenirs, sample some food, and so on.
Can I rely on credit cards in most places, or do I need to get some currency? If so, is it better to exchange in advance before I arrive (in the USA), or can I wait until in the country? Where in London can I find a more reasonable exchange rate? I suspect Heathrow airport might not be the best place to do that.
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Is it better to exchange money or use credit card?
You should always opt to pay using the foreign currency when given the option between paying in your home currency or the foreign currency. The currency conversion rate that your card issuer will use is certainly going to be better than the conversion rate charged through dynamic currency conversion.Is it cheaper to exchange cash or use card?
When you exchange cash, you get a significantly worse exchange rate than when you use a card. The difference can be as much as 6%. This is why using a card is better. However, you should not use a credit card to get money out of ATMs.Do people in London use credit cards?
Credit cards, debit cards and contactless payment types are widely used throughout Britain and are the easiest way to pay for things. Visa and Mastercard are the most common type of cards, while American Express and Diners Club cards are less commonly accepted but still facilitated.Should I exchange money before I travel to England?
Bring a small amount of cash, around 50 or 100 pounds' worth, ideally purchased before your departure, since airport exchange rates are notoriously bad. You will, however, get a better exchange rate if you withdraw money from an ATM using a debit card.SHOULD I GET A CREDIT CARD UK | 3 reasons FOR \u0026 AGAINST you getting a credit card in your 20s
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