You can’t go too far wrong with the big names, for example, Bollinger, Moët & Chandon or Pol Roger (reputedly Winton Churchill’s favourite). However, if you’re not serving it until midnight and you have a crowd, you may be able to sneak in a supermarket own label as palates maybe somewhat jaded at that stage. And to be fair, some of the own label Champagnes punch well above their price bracket these days.