Exchange rates will vary as you travel, and in tourist areas you will frequently see traders who specialize in converting currency, including American cash and euros into British pounds. Rates are often very clearly posted (look for the codes USD for U.S. dollar and GBP for Great British pound) and might seem competitive, but if you look at the small print or ask the money changer, you will find that there are associated fees. These fees are either a flat charge or a percentage of the money changed, and they can add up. Other places to exchange currencies that usually offer lower rates include local banks in London and many larger post offices. Some hotels also offer currency exchange on site.