[4][5][6] In August 2017, it was announced that Tandem would fully acquire Harrods Bank, founded in 1893, in a deal that would bring a near-£200m loan book, over £300m of deposits and nearly £80 million of capital.
It offered a variety of personal and business current and savings accounts, mortgages, foreign currency and gold bullion trading services.
[8] In August 2020 Tandem acquired green home improvement loan specialists Allium Lending Group.
[10] In January 2022 Tandem Bank acquired consumer lender Oplo, creating a combined business with £1.2 billion of total assets.
[13] In November 2022, the bank launched its new Tandem Marketplace, providing information and resources to help promote greener living.