Sorry, you won't get your cheque quite yet. For the last instalment in the Walter Merricks claim against Mastercard on behalf of us all (well, most of us) see - https://www.breakinglaw.co.uk/search/label/MasterCard%20claim
Mastercard did not like the ruling that, when someone had had the potential to collect compensation as at 06 September 2016 but had since died, the personal representatives of their estate could step into their shoes. So Mastercard decided to challenge that ruling through an appeal. But they needed permission to appeal. The Competition Appeal Tribunal has just refused permission. If they have the will and the energy, Mastercard could now ask the Court of Appeal to grant permission. However, this should not slow down the preparation for a final hearing. Bigger than Depp and Vardy!