There is no cash limit to bring into the UK money from abroad, however you do need to declare if you bring cash to the UK of £10,000 or more. When you arrive in the UK, follow the “goods to declare” or “red channel” signs, and tell a Border Force officer you want to declare cash.

Within the UK (traveling domestically between England, Scotland, and Wales), there is no legal limit on how much cash you can carry. However, for international travel, if you are entering or leaving Great Britain with £10,000 or more (or the equivalent in any currency), you are legally required to declare it to UK Customs. If you are traveling to or from Northern Ireland, the threshold is €10,000. This declaration is a simple process that can be done online up to 72 hours before travel or at the airport. It is important to remember that while carrying large sums isn't illegal, "reasonable suspicion" laws allow police or border officers to seize any amount of cash (even under the limit) if they suspect it is the proceeds of crime or intended for illegal use. They can hold it for 48 hours without a court order while they investigate the source and intent.