Cash is less secure than a credit card. Unlike credit cards, if you lose physical money or have it stolen, there's no way to recover your losses. Less Convenient. You can't always use cash as a payment method.
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Even though it is technically not illegal to travel with large amounts of cash, it is definitely suspicious to many law enforcement officers. Carrying a large amount of cash can result in asset forfeiture and seizure, even if you are not arrested for an offense.
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.
We don't mean in a suitcase under your bed – in fact, paying for a house with physical cash usually isn't allowed because of UK money laundering rules. Instead, you'll be using the money sitting in your bank account.