To send money over £250, RBS still use hardware card readers for their MFA flow. You put your debit/credit card in the device, entry your normal pin and then a code that is displayed on the website. It's a little inconvenient of you don't have the device with you when you need to send large amounts of money but in general it's great to have rather than SMS.

Of course, I expect that eventually they'll move to SMS too since it's easier for them and more on line with the rest of the industry.