Yes, there are limits on transactions.

Incoming transactions: Payments into your account are uncapped unless they would increase your balance to over your account limit.

Outgoing transactions:  For Faster Payments there's a limit of £10,000.

Card transactions: Single transaction limit of £10,000. Weekly limit is £20,000 and
Monthly limit is £50,000.

Cash withdrawals:  £500 per day and £4,000 per month.

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