I haven't forgotten that collective claim agsinst MasterCard. Nor, I suspect, have you. For the background see http://www.breakinglaw.co.uk/search/label/MasterCard%20claim
Walter Merricks who is bringing the claim is applying to the Court of Appeal for permission to appeal against the claim's dismissal and, alternatively, for permission to apply for judicial review of the decision to dismiss the claim. Both applications will be heard together at the Royal Courts of Justice in London on 31 October 2018. I will report back on the outcome.