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.
In N. Ireland its GBP (Sterling) as in Scotland but Scotland does have its own Â£5/Â£10/Â£20 etc. notes which are legal currency in England as well - though sometimes the English shopkeepers look at you strangely when you try to use them!