Yes, there are limits on transactions.
Incoming transactions:
Payments into your account are uncapped unless they would increase your maximum balance. Limited companies have a maximum balance of £100k (£50k for sole traders)
Outgoing transactions:
For Faster Payments there's a limit of £10,000 per transaction
Card transactions:
Single transaction limit of £10,000
Weekly limit is £20,000
Monthly limit is £50,000
Contactless limit is £45 per transaction
Cash deposits:
Minimum single transaction limit £10
Maximum single transaction limit £500
Cash withdrawals:
Daily limit is £500 per day and £4,000 per month