Go to Settings > Touch ID & Passcode. On devices without Touch ID, go to Settings > Passcode: Tap Turn Passcode On. Enter a six-digit passcode. Or tap Passcode Options to switch to a four-digit numeric code, a custom numeric code, or a custom alphanumeric code. Enter your passcode again to confirm it and activate it.
Wales uses the same currency as the rest of the United Kingdom, the British Pound Sterling.
Quick Answer. About.com reports that the legal currency in London is the pound sterling. The official London visitor's site notes that despite being a member of the European Union, the United Kingdom does not use the Euro as standard currency.