London-based Bench Walk Advisors is backing a class action lawsuit to be launched imminently against Visa and Mastercard for allegedly unlawfully overcharging businesses for accepting credit and debit card payments on corporate cards and on consumer cards used by overseas visitors. Harcus Parker, a UK commercial litigation law firm, will bring the claim at the Competition Appeal Tribunal (CAT), the UK’s specialist judicial body for hearing competition cases. The CAT is expected to hear the first round of the case in 2022, when it will decide whether the case can be certified to go forward to trial.