Finance whiz Caroline Butler took to TikTok to tell her followers about changes that are set to roll out across three of Britain's major high street banks this month. With , , and all on the cusp of implementing sweeping changes, Butler is urging customers to stay informed.

"A lot of changes are going down, which you probably don't know about," she pointed out in her video update. "This is all happening this month, and people aren't sufficiently kept in the loop by banks. So make sure you know what's going on with your bank - check emails, log into your bank and just make sure you're not missing out on anything."

Breaking down the impending shifts, Caroline offered her insights alongside tips to dodge any negative impacts on one's finances.

For those banking with NatWest, a significant move was highlighted by Caroline: NatWest is set to take over Sainsbury's Bank's savings and credit card loans. "If you have any of those to do with Sainsbury's, things are going to change for you," she warned viewers.

On their online platform, NatWest confirms the transition: "As of 1 May 2025, NatWest became the legal owners of certain personal loans, credit cards and savings accounts. There are no immediate changes to how customers use and access their account(s)."

The bank commits to collaborating effectively with Sainsbury's Bank to ensure a seamless and secure transfer process for its clientele,

Caroline also issued an alert for Barclays customers, revealing that the bank is "slashing the rate" of its Rainy Day Saver accounts from a healthy 5.12% to a lower 4.61%.

Barclays said on its website: "Interest rates on the Rainy Day Saver are banded. This means you'll earn 4.61% AER/4.52% gross p.a. interest on the first £5,000 of your balance, and 1.00% AER/gross p.a. on your additional balance over £5,000."

Turning to Santander, Caroline highlighted that from May 12, the bank will be scrapping its text alert system, which could be a significant change for those who rely on it for financial management.

"So if you rely on those alerts for managing your money, then you need to be mindful of that," she advised. "You'll need to switch to their app or start using mobile banking."

Santander's guidance states: "If you've registered for some alerts on a Personal current account or savings account, from 12 May 2025 we'll stop sending them. We're doing this because you can get a more detailed view of your account activity with Mobile or Online Banking."