On 16 April 2019, England’s Court of Appeal ruled that the Competition Appeals Tribunal (the “CAT”) had erred in rejecting certification of former financial ombudsman Walter Merricks’ class action against MasterCard, for £14 billion.  As a result, the CAT will now reconsider whether to certify the class. The decision has lowered the bar that will need to be cleared in this and future class actions in order to achieve certification. Louise Freeman and Harry Denlegh-Maxwell consider the decision and its implications for the UK’s fledgling class action regime in this Covington Alert.