Just a small question I've been meaning to post for the last week.. On my BP flight AKL -> SYD on Boxing Day Air NZ were serving Charles Heidsieck Reserve. Has there been a move away from the Mumm they've been serving for the last few years or is this just being served TT and Mumm on longhaul?

Living in Wellington means I don't get to experiences the luxuries of BP on TT flights.