Bon, voilą, it doesn't even work if I try to do a dummy change of booking for GVA-BRS. The easyJet site is about as fit as everything to do with IT in Western Europe these days. It's impossible to select a different date, everything is greyed out, so a new separate booking it has to be. We're talking about early March here. So I just need to sure that it won't affect my ability to fly back to Geneva a few days later.