Santander acquired Abbey in 2004 and Bradford & Bingley in 2008, but today (11 January) is the first time both will operate under the name Santander.
The branding will rollout to include the 278 branches Alliance & Leicester, acquired by Santander in 2008, later in the year.
The official arrival of Spain's financial institution will be marketed to UK consumers through a multimillion pound advertising campaign, created by WCRS. Media planning and buying will be handled by Aegis Media's Carat.
As well as informing consumers of the re-brand, ads will promote the launch of Santander's much-vaunted Zero Current Account across all its branches.
The account, available to Santander mortgage customers, features 6% interest rates and no overdraft fees
Antonio Horta-Osorio, Santander UK chief executive, said: "The success of our UK business has given us the confidence to move to the Santander name now and with it deliver the next phase of our transformation programme."
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