Tandem Bank is a digital bank offering mortgages, credit cards, and savings products in the UK. The bank recently purchased Allium Lending Group, a specialist lender focused on helping customers transform their homes, to become more energy-efficient and environmentally friendly, by financing everything from home insulation, energy-efficient boilers, and double glazing, to solar panels, heat pumps, and home charging stations. Helping you save more than just your money.