On 11 December 2020 the Supreme Court handed down a very significant judgment relating to the certification of a £14bn opt-out competition collective action brought by Walter Merricks against Mastercard, in respect of losses alleged to have resulted from the use of anti-competitive multilateral interchange fees.

Our competition litigation team published an initial blog post last week, but has now published a further post exploring the decision and its practical implications in more detail.

The team also presented a webinar earlier today discussing the implications of the Merricks judgment for the UK competition collective actions regime. You can register here to access the recorded version.